Ineed which one is the correct answer

Initial - M
number of people - 8 out of 100
8/100 = f/2000
100 x 20 = 2000
(do the same thing to top/numerator)
8 x 20 = 160
160/2000

So the correct answer would be b). 8/100 = f/2000.
And the answer would be 160 people out of 2000 people would be expected to have the letter M for a first-name initial.