Save You More offers a buy one/get one free item each week. Customers who purchase only one of the items must pay the regular price. The limit is one deal per customer. Is the relation (# sale items purchased, price) a function? Why or why not?

A) It is a function because the input can be either 1 or 2 items, but the output will always be the same price.
B) It is not a function because the input can be either 1 or 2 items, but the output will always be the same price.
C) It is a function because the input will always be the same price, but the output can be either one or two items.
D) It is not a function because the input will always be the same price, but the output can be either one or two items.