If k^3 is divisible by 120, what is the least possible value of integer k?  Answers.
A) 15  B) 30  C) 60  D) 90  E) 120

Rationale: "k ^ 3 = 120 * x = 2 ^ 3 * 3 * 5 * x the factors of k must at minimum include 2 * 3 * 5 = 30 . the answer is b ."
Answer: B