求救一个OG问题, 第99题. 哪位请给予指点,本人数学很烂.

99. 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的5次方  D) 5的10次方  E) 8的10次方-3的10次方