A prime number contains the digit X at unitâ€™s place. How many such digits of X are possible?

A prime number contains the digit X at unitâ€™s place. How many s

1.	A prime number contains the digit X at unitâ€™s place. How many such digits of X are possible?
A.	3
B.	4
C.	5
D.	6
Answer» E.