Which of the following is an example of the associative property of multiplication?

A) 7 · (3 · 5) = (7 · 3) · 5
B) 7 · 1/7 = 1
C) 7 · (3 · 5) = 7 · (5 · 3)
D) 7 · (3 + 5) = 21 + 35