Given the following relation:
{(0, 0), (1, 0), (2, 3), (2, 5), (3, 18)}
Which sentence best explains why it is not a function?

A. There are two ordered pairs with the same first coordinate and
different second coordinate.

B. There are two ordered pairs with the same second coordinate.

C. (0,0) is one of the ordered pairs.

D.There are only 5 ordered pairs.