If $x$ is a prime number greater than $2,$ which of the following could be a prime number?

If $x$ is a prime number greater than $2,$ which of the following could be a prime number?

(A) $x^2$
(B) $\dfrac{x}2$
(C) $3x$
(D) $x-4$
(E) $x^2+1$

Answer: D

Source: GMAT Paper Tests

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