Plz help
13) Choose the correct answer.
Which situation represents a proportional relationship?
a) the total cost of purchasing unlimited pizza slices for $9.99 at a buffet-style restaurant
B) the total cost of purchasing dress hats for $24.95 each and a hat box for $9.99
C) the total cost of purchasing coordinated T-shirts and shorts for $19.50 per outfit
D) the total cost of buying DVDs for $15.95 each plus a shipping fee of $6.75