How do the graphs of f(x)=x^3 and g(x)=(1/2 x)^3 relate?
A. G(x) is a horizontal stretch of f(x) by a factor of 2.
B. G(x) is a vertical stretch of f(x) by a factor of 8.
C. G(x) is a horizontal of f(x) by a factor of 1/2.
D. G(x) is a vertical stretch of f(x) by a factor of 1/2.