If (6)(x^2) has four different prime factors, at most how many different prime factors does x have?  Options:  A) 1  B) 2  C) 3  D) 4  E) 5
x can have at most 4 prime factors, namely the prime factors 2 and 3, plus 2 others.   If x had more than this number of prime factors, then (6)(x^2) would have more than 4 prime factors.   The answer is 4.
<result>D</result>
If (6)(x^2) has four different prime factors, at most how many different prime factors does x have?