Please help me I will give you extra points and the brain thing. Which statement about this mapping is true? image below

A. The mapping does not represent y as a function of x, because there are more x-values than related y-values.

B. The mapping represents y as a function of x, because each y-value is related to exactly one x-value.

C. The mapping does not represent y as a function of x, because 1 x-value is related to 2 y-values.

D. The mapping represents y as a function of x, because each x-value is related to exactly one y-value.