A sign in the store window advertises 3 t-shirts for $16.50. Which coordinate pair shows the unit rate for the t-shirt sale?

Responses
A (0, 0)(0, 0)
B (1, 5.5)(1, 5.5)
C (2, 11)(2, 11)
D (3, 16.5)

The answer is D. (3, 16.5) because the unit rate is the price per t-shirt. In this case, the unit rate is $16.5 divided by 3 t-shirts, which equals $5.5 per t-shirt.