Suppose f(x)=x^2 and g(x)=(2x)^2. Which statement best compares the graph go g(x) with the graph of f(x)?
A. The graph of g(x) is vertically stretched by a factor of 2.
B. The graph of g(x) is horizontally compressed by a factor of 2.
C. The graph of g(x) is horizontally stretched by a factor of 2.
D. The graph of g(x) is shifted 2 units to the right.