Answer:
C
Explanation:
f(4x) is the same as 1/4x, so every value of x has been, as you could say, 'multiplied' by 1/4, so instead of x=1 y=1, when x=1, y would be 1/4, x=2 is y=2/4=1/2, x=3 is y=3/4 and so on. This is basically a compression compared to f(x) and its compressed horizontally as the x value has been affected
:)