Which situation could NOT represent a proportional relationship?
A The number of gallons of water in x barrels with 42 gallons of water in each barrel
B The amount an employee who makes $8.50 per hour earns in h hours
C The weight in x weeks of a puppy that gains 2 pounds per week if its starting weight is 8 pounds
D The cost of purchasing p pounds of bananas for $0.55 per pound