I think it is because the answer choice "A" does not provide an explanation for why everything tasted sweet, leaving the reader wondering. D, however, gives an explanation.
Answer:
A. Identify and focus your niche
Explanation:
Secondary research is designed to help you identify and focus your niche.
Secondary research is a summary of the main points of existing research.
It would be "critiquing the text."
Answer:
the last sentence
Explanation:
it involves the first passage and the second passage.