Erik often runs his laptop computer on battery power. He knows that the longer he runs on battery power, the less power the battery will have.
A. The number of hours the battery will run is a function of the
number of computers Erik has.
B. Erik's choice of a laptop computer is a function of the amount of
power the battery will hold.
C. The amount of power in the battery is a function of the time Erik
runs the computer on the battery.