Which of the following does not represent a proportional relationship?
A. Nicole earns $5 per hour. How many hours must she work to earn $100?
B. Frances walks 2.2 miles every 30 minutes. If she continues to walk at this rate, how far can she walk in 4 hours?
C. Juanita has 7 ceramic frogs in her collection. In addition, she will receive 3 ceramic frogs for her birthday each year, how many ceramic frogs total will she have in 10 years?
D. The earth rotates on its axis every 24 hours. How many rotations will the earth complete in 15 days?