SO the answer is B

http://prntscr.com/l6s2s4

how do i do the conversions of the cars?

We have 9 "whole" cars and 2 "half " cars....but 2 "halves" gives us another whole one

So...we have 10 whole cars

And Coupeville manufactures 2 + 1/2 0f them = 2.5

So....the fraction made in Coupeville = 2.5 / 10 = 1/4 ⇒ B

Was just a bit too slow before CPhill got the same answer!.