Which of the following statements is not true?

Options

A. The difference of two prime numbers, both greater than 2, is divisible by 2.
B. For two djfferent integers m, n and a prime number p, if p divides the product m`xx` n, then p divides either m or n.
C. If a number is of the form 6n - 1 (n being a natural number), then it is a prime number.
D. There is only one set of three prime numbers such that there is a gap of 2 between two adjacent prime numbers.