What is the smallest integer k for which 64^k > 4^20?	Pick one
A) 4	B) 5	C) 6	D) 7	E) 8

Rationale: "64 ^ k > 4 ^ 20 4 ^ ( 3 k ) > 4 ^ 20 3 k > 20 k = 7 the answer is d ."
Answer: D