Which transformation of f(x) will produce the same graph as g(x)?

f(x) = 3x
g(x) = f(x) + 3

A.
h(x) = f(x) + 1
B.
h(x) = 2f(x)
C.
h(x) = f(x + 1)
D.
h(x) = f(x − 1)