What is an example of the inclusion homomorphism of H into G?
a) H = 1, 2, 3, G = 1, 2, 3, 4, 5
b) H = a, b, c, G = a, b, c, d, e
c) H = x, y, G = x, y, z
d) H = red, green, blue, G = red, green, blue, yellow