Page 3. The graph of which of the following would show a linear relationship?
a) The number of prom dresses bought throughout the year recorded monthly
b) The rate of hikers going up a trail and then back down recorded every 20 minutes
c) The number of fireworks bought throughout the year recorded monthly
d) The pulse of a cat cornered by a dog from 30 minutes before to 30 minutes after the incident.
e) The amount of mail going through the post office from December 1st to December 25th.