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Basically is X an integer with 3 in the units digit: 3, 13, 23, 33, etc
1. Multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, 32 etc. None of these numbers + 2 will give us 3 in the units digit SUFFICIENT 2. x>4 doesn't help us because X could be 12 (not work) or 13 (works) INSUFFICIENT
You can see from A that 4n+2 always gives an even number, and plugging the result into 3x+1 always gives an odd number. All multiples of ten are even numbers, so you'll never have a perfect multiple of 10.
With B, you can have n=5 which doesnt give a remainder of 0, or n=13, which does. Insuff.