Suppose f(x) = x^2 and g(x) = (4x)^2. Which statement best compares the graph
of g(x) with the graph of f(x)?
A. The graph of g(x) is shifted 4 units to the right.
B. The graph of g(x) is horizontally stretched by a factor of 4.
C. The graph of g(x) is vertically stretched by a factor of 4.
D. The graph of g(x) is horizontally compressed by a factor of 4.