-3
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I am trying to answer this puzzle - which of the five potential answers is correct, and why?

enter image description here

This test comes from Metropol iq1 book

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    $\begingroup$ it seems like that this puzzle comes from elsewhere. please provide the source. unattributed work may get downvoted or even closed. happy puzzling ;) $\endgroup$ – Omega Krypton Nov 9 '19 at 10:40
  • $\begingroup$ this puzzle my friend created and sent to me $\endgroup$ – black Nov 9 '19 at 10:41
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    $\begingroup$ 'Your friend' appears to be creating and sending you quite a few of these... (There were more of these yesterday...) Is there a reason why you cannot ask this friend for the same assistance you're asking of us? Do they mind you asking all of them on Puzzling? $\endgroup$ – Stiv Nov 9 '19 at 12:18
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    $\begingroup$ @OmegaKrypton So if you suspect, as I assume you do, that this puzzle comes from some sort of test that OP is trying to cheat on or something of the kind, why did you answer it? $\endgroup$ – Gareth McCaughan Nov 9 '19 at 12:24
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    $\begingroup$ @GarethMcCaughan seeing the OP's confession I have deleted my answer. $\endgroup$ – Omega Krypton Nov 9 '19 at 14:46
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The answer is d) 15 because it is the midpoint between 18 and 12. +3 and -3 respectively.

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