If k^3 is divisible by 168, what is the least possible value of integer k? Choose the correct option.
A) 36 B) 42 C) 48 D) 54 E) 60

Rationale: k ^ 3 = 168 * x = 2 ^ 3 * 3 * 7 * x the factors of k must at minimum include 2 * 3 * 7 = 42 . the answer is b .
Answer: B