Answer:
A
Explanation:
The subject of the sentence is "answer," a singular noun. (No, "questions" is not the subject because it is contained within the prepositional phrase, and subjects are never located there --- even though you might be fooled into thinking that since that noun just happens to be located next to the verb). Therefore, the verb must also be singular for subject-verb agreement. "Was" is a singular verb.
"Consistently" (an adverb) is appropriate, not "consistent" (an adjective).
