An Athlete Wanting to Strengthen His Cardiovascular System Will Bench-Press

An athlete wanting to strengthen his cardiovascular system will bench-press a weight, w, as many times, N, as possible. The following table shows the relationship between N and w.
Assuming linearity, let N be a function of w. What is the physical interpretation of the slope?

A) The number of bench-presses the athlete can do if there is no weight.
B) The decrease in the number of bench-presses the athlete can do as the weight increases by 1 pound.
C) The decrease in the weight the athlete can lift as an additional bench-press is required.
D) The amount of weight at which the athlete can no longer do any bench-presses.