Discreet math function composition question

Suppose that g:A -> B and f:B -> C where A = B = C = {1, 2, 3, 4}, g ={(1, 4), (2, 1), (3, 1), (4, 2)}, and f = {(1, 3), (2, 2), (3, 4), (4, 2)}. Find g o f.

A. g o f = {(1, 2), (2, 3), (3, 3), (4, 2)}

B. g o f = {(1, 1), (2, 1), (3, 2), (4, 1)}