Task: Question Answering
Input (English): Problem: the “ length of integer x ” refers to the number of prime factors , not necessarily distinct , that x has . ( if x = 60 , the length of x would be 4 because 60 = 2 × 2 × 3 × 5 . ) what is the greatest possible length of integer z if z < 1,000 ? 
Options: a ) 13 , b ) 10 , c ) 9 , d ) 7 , e ) 6
Output (English): c