Let $A=\{x:x$ is a prime factor of $240\}$
$B=\{x:x$is the sum of any two prime factors of $240\}.$
Then

• A

  $5\notin A\cap B$

• B

  $7\in A\cap B$

• C

  $8\in A\cap B$

• D

  $8\in A\cup B$