Suppose We Observed That the More Firefighters There Were at a Fire

Suppose we observed that the more firefighters there were at a fire site,the greater the amount of fire damage.Suppose we also observed that the size of the fire was related to both the amount of damage and the number of firefighters present.In this case,we would call size of fire the

A) independent variable.
B) dependent variable.
C) intervening test variable.
D) antecedent test variable.
E) control variable.