confused with first blank still

An explanation for the first blank:

The comprehension is delayed(impeded) by complexities. Since only a complete or exhaustive comprehension can be delayed by the complex details (labyrinthine complexities), the answer is A.

exhaustive leads to labyrinthine complexities.

(i) An exhaustive comprehension of the character of Italian wine is impeded not only by labyrinthine complexities of vineyards and varietals, but also by fluctuations in environmental conditions from year to year, which render even the most reliable vintages subject to remarkable variance.

complex vineyard systems and fickle weather conditions make it impossible to understand wine's character completely (exhaustively), because even the most seasoned wine differs in taste from year to year.

Question:

(i) __________ comprehension of the character of Italian wine is impeded not only by labyrinthine complexities of vineyards and varietals, but also by fluctuations in environmental conditions from year to year, which render even the most reliable vintages subject to (ii) ___________.


We know that some kind of comprehension was impeded by labyrinthine complexities of vineyards and varietals.

What kind of comprehension is impeded(prevented, obstructed, stalled) by labyrinthine complexities of vineyards and varietals, fluctuations in environmental conditions from year to year?

Given the list of challenges, we can say a complete or thorough comprehension is impeded or obstructed. Only an exhaustive fits the bill.

It cannot be a futile comprehension because, it means a failed comprehension, and such a failed comprehension does not need any of obstruction or impediment. Irredeemable is too judgmental and qualitative and is the wrong choice.

Now, we are told that these fluctuations in environmental conditions from year to year, render even the most reliable vintages subject to something. What can it be?

Now since even an exhaustive comprehension is not possible because of labyrinthine complexities and varieties, and now we even have fluctuations in environment, we can say even the reliable vintages become subject to variations and are no longer of just one type. So remarkable variance is the correct answer.

The adjectival phrase "even the most" before "reliable" makes us look for a word which suggests unpredictability or maximum unreliability , and only a remarkable variance can convey that sense.

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