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sdanquah
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I would choose D.


By 1), the last digit is 2.

By 2), if I remember it correctly, it is how we define a prime number.
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Paul
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my ballot for D
1) other than 1 as divisor, if least divisor is n, then n must be prime
2) definition of a prime number
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sdanquah
Is n a prime
1. n is the least factor of Y that is greater than 1
2. n has only two factors


D

1 is sufficient .... (catch: if Y is prime ~ n=Y)
2 is sufficient .... (factors 1 and n)



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