Yan is climbing down a ladder. Each time he descends 4 rungs on the ladder, he stops to see how much farther he has to go. If Yan made 8 stops with no extra steps, which expression best shows another way to write the product of the number of ladder rungs that Yan climbed?
A. 4 + 4 + 4 + 4
B. 8 + 8 + 8 + 8
C. (-1) (4 + 4 + 4 + 4)
D. (-8) + (-8) + (-8) + (-8)