According to the histogram of frequency distribution, the frequencies of 90 ~ 100 and 130 ~ 140 are 0.45 and 0.05, respectively.

Since the number of people in the score of 130 ~ 140 is 90, the total number of people is 900.05.

So the number of people with the score of 90 ~ 100 is 900.05×0.45, which is 8 10.

So the answer is C.