At a flea market, used computer games are sold at the prices shown in the table below.
Number of Games Price ($)
9.00
5 22.50
31.50
Do the number of games and price form a proportional relationship?
Choose the correct response.

a. Yes. There is a constant of proportionality of $11.25.

b. Yes. There is a constant of proportionality of $4.50.

c. No. There is not a constant of by proportionality.

d. No. The slope is 4.5.