OK I admit I have no clue about this topic. So I strategically guessed and picked 18.
here is why....maybe it can help those who dont know these rules..(me
well the last digit is 4 (which means its even, i.e divisible by 2)
the sum of the other remaining digits is 23...
hmm, all I know is that for a number to be divisible by 3, its sum must be divisible by 3... (so we have 23+4=27, which is divisible by 3!)
now, I know that this number cannot be a prime (because of the 4!)eliminate choice (e). Next lets look at 27...since 27 is the sum of the 4+23 above I guess its just a trap answer so eliminate (d). now look at 23, 23 is just one of the numbers from the question stem, eliminate it (C)...now we have B, 18, 18 is a product of 2 and 3. meets both criterias, therefore the likely answer...pick B.
Again I wont do this if I knew how to solve the problem, but I am guessing so why not put some thought into it!