Which of the following is a prime number ?	Select the correct option:
A) 9  B) 8  C) 4  D) 2  E) 1
Explanation :   2 is a prime number   A prime number is a natural number greater than 1 which has no positive divisors   other than 1 and itself.   Hence the primer numbers are 2,3,5,7,11,13,17,... Answer : Option 2
<result>D</result>
Which of the following is a prime number ?