I solved this by different method,

1) P + 2 and P – 2 are prime.

--> if You can list out all two digit Prime Numbers, you will get P=15 ONLY for which P+2 & P-2 are primes.

since 15 is not prime, Sufficient

2) P – 4 and P + 4 are prime.

--> Again, if You can list out all two digit Prime Numbers, you will get P=15 ONLY for which P+4 & P-4 are primes.

since 15 is not prime, Sufficient

hence D.

though the answer is correct by this method, I feel Bunuel's Method was more proper !!

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