I'll do my best to explain my interpretation of why C > A.

To start at the beginning, we are ask to weaken the premise of "the absence of signs for three weeks means the mice have been eradicated by the poison".

When I looked at A, I thought the same way the OE stated. The premise asks for absence of all signs, which include droppings, chewed up things etc. Just because I don't see or hear the mice, doesn't mean they are gone for good.

However, when I looked at C, I saw it as a more reasonable thought process. Let's say that the there is no signs whatsoever. This means no droppings, no chewed up things, no seeing mice. It's all gone. If presented with answer C, that some mice will go away and come back, it weakens what the Exterminator said. Answer (A) gives you leeway in the sense that mice could still be active in those three weeks but you just wouldn't know it. Answer (C) says that they are not active in those 3 weeks, but they will come back after those three weeks.

Sorry if my explanation is poor, I tried.

I think that C is true answer

I think C. But these methods are only temporary methods to prevent rodents come in to the house and sometimes if we don't see their signs then also we cannot determine if they are permanently gone or not because there might be a chance that they are out in the summer searching for food and then next winter again they are in your home. So I think to get permanently rid of them pest control by the professional pest control services providing companies is the best option.

When dealing with short, argument-based reading comprehension, first identify the question task as it pertains to the conclusion. In this case, we are asked to weaken the exterminator's claim.

The second step, is to identify the conclusion. Here, the question itself already does that work for us by identifying the claim as "that the absence of signs for three weeks means the mice have been eradicated by the poison".

The third step is to try and predict an answer yourself, broadly. In this case we need to show that just because the mice are absent ≠ "eradicated by poison".

Finally, look to the answer choices for an option that provides information that matches our prediction that mice are absent ≠ "eradicated by poison".

(A) Because mice hide whenever they sense humans, it is very difficult to see or hear mice even when there is an active infestation.
- Eliminate. Look for vague terms or information that requires further interpretation. Here, we cannot determine whether the mice in question can "sense humans" in order to appropriately evaluate the impact on the conclusion.

(B) It is more humane to use “live-catch” traps that allow homeowners to release the still- living mice outside.
- Eliminate. Alternative approaches have no impact on the argument at hand.

(C) In the spring, many mice that nest in houses begin foraging for food outside and do not return to the comfort of the house until the fall or winter.
- Select. This provides another reason that the mice may be absent that would not require that they have been eradicated by the poison.

(D) There are several different kinds of poison that could be used, some of which are more effective than others.
- Eliminate. Alternative approaches have no impact on the argument at hand.

(E) It sometimes takes longer than three weeks for all of the mice to ingest and die from the poison.
- Eliminate. "Sometimes" is a vague term that is impossible to use to evaluate the current situation.

and spring is not the only season to kill mice

from my perspective the best answer is A
because if you can't find sign of mice exitance you can't till if they are still their or gone
c is limited to spring season
E is limited when mice have shortage in food so they used to storage food for winter then they consume it
but with plenty of food like houses they will consume it right the way

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