Which one of the following numbers is the greatest positive integer x such that 3^x is a factor of 9^5?	Choose the correct choice from the following.
A) 5
B) 8
C) 10
D) 15
E) 19
9 = 3*3= 3^2   9^5 =(3^2)^5   =3^10   we have to find the greatest positive integer value for x   when x=10, it divides exactly once and that is the least positive integer value of the quotient   therefore, the correct option is 10
<result>C</result>
Which one of the following numbers is the greatest positive integer x such that 3^x is a factor of 9^5?