In this question try to use logic and common sense rather than trying to multiply each side.
Remember the basic rule: -ve * -ve = +ve. In other words whenever even number of -ve's are multiplied always the product is a +ve number.
Also remember anything multiplied by 0 is always 0. This is the only logic the question is trying to test.

In qty A when you list the number to be multiplied you get an even numbers from -7 to 7 inclusive. i.e {-7,-5,-3,-1,1,3,5,7}.
In qty B when going from -ve to +ve there is 0 as well which will transform the whole product into 0
Hence it does not matter what is the value for qty A as long as we know that the value is +ve.

option A