If f and g are real-valued functions such that f(x) is o(g(x) ) , then for every positive integer n:
A. fⁿ (x) = o(gⁿ (x) )
B. fⁿ (x) ≤ gⁿ (x)
C. fⁿ(x) is o(gⁿ(x) )
D. f(n x) is o(g(n x) )