Which of the following is not a function?

Question

A. A subject area paired with the number of credits needed to graduate from your school.

B. A student’s name paired with the sport that they play.

C. A classroom number paired with the number of students who entered the classroom yesterday.

D. A student’s unique identification number paired with their grade level.

Answer 1

For B, since some students play multiple sports, this is not a function (requires just one output for a given input).