A divisor of y

Hi mates!

I've found the following problem, which I don't know how to solve:

[i]If x is an integer and y = 3x + 2, which of the following CANNOT be a divisor of y?[/i]
A) 4
B) 5
C) 6
D) 7
E) 8

Any ideas?

Many thanks in advance!!

Ivan