Respuesta :

f(x) = 1 + x
so
f(3) = 1 + 3 = 4
f(1) = 1 + 1 = 2
2f(1))= 2(2) = 4
so
f(3) - 2f(1) = 4 - 4 =0
g(f(3) - 2f(1)) = 0 - 0 = 0

answer
B