I have no idea if I'm doing it right but my guess would be to take the values that we get from f(x) and g(x) when x = 1. Therefore we get that f(x) is equal to 4 and g(x) is equal to -1. We than just do f/g which is 4/-1 which gives us the final answer of -4 which is option B.
If you take the amount of green markers and divide them by the total, you come up with 0.21 If you do likewise with the others, you respectively come up with 0.47 and 0.32.