单项选择题

Questions 3 to 6 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.
What will the college students do for the high school students

A.Employ them as lab assistants.
B.Teach classes at their high school.
C.Help them with their studies.
D.Pay them for participating in the study.