Which situation could not represent a proportional relationship?

a. the weight in x weeks of a puppy that gains 2 pounds per week if it starting weight is 8 pounds.

b. the number of gallons of water in x barrels with 50 gallons of water in each barrel

c. the cost of purchasing p pounds of bananas for $0.55 per pound.

d. the amount an employee who makes $9.25 per hour earns in h hours