Proverse Has Individuals Cycle on Stationary Bikes for 0, 10

Multiple Choice

Proverse has individuals cycle on stationary bikes for 0, 10, 20, or 30 minutes, after which he measures their self-reported mood. In this hypothetical study, the dependent variable is:

A) the self-reported mood.
B) the individuals who do not ride on the stationary bike.
C) the number of minutes individuals ride the bike.
D) the riding of bikes.