What is the greatest positive integer E such that 3^E is a factor of 9^10?	Choose the correct choice from the following choices:
A) E=5
B) E=9
C) E=10
D) E=20
E) 30
What is the greatest positive integer E such that 3^E is a factor of 9^10?   9^10 = (3^2)^10 = 3^20   D. 20
<result>D</result>
What is the greatest positive integer E such that 3^E is a factor of 9^10?