Answer:
The question about volunteer opportunities which could best be answered using only prior knowledge is the following one:
Which type of volunteer work is the most time consuming?
Explanation:
Prior knowledge is the information one already has due to reading, studying or having experienced a certain thing. Therefore, the question "Which type of volunteer work is the most time consuming?" can certainly be answered using prior knowledge, since it is about data and facts that were gathered sometime in the past.
The other questions must be ruled out for the following reasons:
The question "Which local organization is most in need of more volunteers?" requires research or asking around in order to be answered, since it is about a current problem that is yet to be solved.
The question "What type of volunteer work would be the most rewarding?" involves subjectivity, since it is about how one feels after doing volunteer work, and subjectivity varies according to each individual.
The question "How many volunteers will be needed for the school fundraiser?" involves information about an ongoing project, and as so needs an answer based on a current necessity.
