Determine whether the following relation is a function. {(3, 7), (3, 8), (3, 4), (3, 1)} A. It is a function because the ordered pairs all have the same x-value.

B. It is not a function because there are multiple y-values paired with a single x-value.

C. It is a function because none of the ordered pairs have the same y-value.

D. It is not a function because none of the ordered pairs have the same y-value.