Ralph conducts an experiment in which he measures aggression in school children at different levels of temperature during recess. The independent and dependent variables are ________________.
A.
the experiment; the levels of temperature
B.
the school children; the levels of temperature
C.
the levels of temperature; the level of aggression
D.
the level of aggression; the time of recess.
E.
the time of recess; the level of aggression