A. The two years in which comparisons were made
Do you have to use words from the back? I feel like none of them fit.
If not, then I'd fill the blank with "range". If yes, then I'd use "spectrum" or "repetoire", though neither of those are a perfect fit.
Answer:
d. because its argumentative,the author is trying to prove a point.
Explanation:
it is used for positive and negative.
