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pick a number so that x(x-1) is not divisible by 3. for exampe 2.
then plugin the different values for k
a) 2*1*6 divisible
b) 2*1*4 not
c) 2*1*3 is
d) 2*1*0 is (0 is divisible by any integer except 0)
e) 2*1*(-3) is
so th answer is b.
the reason for this choice is if x(x-1) already divisible by 3. multiplying it by x-k will not change that...so gives us no information