On a scale that measures the intensity of a certain phenomenon, a reading of n + 1 corresponds to an intensity that is 10 times the intensity corresponding to a reading of n. On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3?

A) 5

B) 50

C) 10^5

D) 5^10

E) 8^10 - 3^10

OA is C

Source is OG 12th ed. PS 98.

Someone please explain the approach to this problem.

Thanks.