Select the number that best completes the analogy: 12 : 132 :: 15 : ?

The relation is $n:n$ squared minus $n$, that is $n\times (n-1)$. Here $12\times 11=132$, so $15\times 14=210$. The distractors each match a weaker pattern: 225 is 15 squared with nothing subtracted, 240 is $15\times 16$ (multiplying by the next number instead of the previous one) and 195 is $15\times 13$.