question_answer

a, b and c are natural numbers such that a, b are co-primes and b, c are twin primes. Now consider the following statements.

I. a must be a prime

II. a, c must be co-prime.

Which of the above statement(s) is /are true?

A)  Only I

B)  Only II        

C)  Both I and II

D)  Neither I nor II