How many numbers in the list $11,12,13,14,15,16,17$ are prime numbers?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
The numbers 12, 14 and 16 are even, and therefore divisible by 2 so not prime.

The number 15 is divisible by 5 ; therefore, it is also not prime.

Each of the remaining numbers, 11, 13 and 17, has no positive divisor other than 1 and itself. Therefore, 3 numbers in the list are prime.

ANSWER: (D)

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