HELP I'M BEING TIMED FOR THIS TEST!!!

Which applies the power of a product rule to simplify (5t)^3?

A. (5t)^3 =5t^3
B. (5t)^3 = 3(5t) = 15t
C. (5t)^3 = 5^3 t^3 = 125t^3
D. (5t)^3 = 5^3t = 125t