Jill's favorite number is even and has some repeating prime factors. John is guessing Jills favorite number, and the only hint she gives is that 7 is a prime factor. What is Johns best guess?  Choose the most appropriate option.
A) 84	B) 105	C) 54	D) 42	E) 70

Rationale: a 84 = 2 * 2 * 2 * 7 b 105 is odd c 54 = 2 * 3 * 3 d 42 = 2 * 3 * 7 e 70 = 2 * 5 * 7 the answer must meet three criteria : odd , have repeating prime factors , and 7 is a prime factor . a is the only answer that meets all criteria
Answer: A