Answer:
C. complete subject
Explanation:
A compete subject is a group of words that performs the action in a given sentence. It answers the question, "who", "what", etc.
Therefore, from the sentence, "(Most of the passengers) received their refunds within a week*, the words in bracket is a complete subject.
A type of paper that serves to inform the reader on how something is done, usually to reach a goal of some capacity.
idk
sorru
Advising A is the answer