[QA] You should have an early night. You don’t feel tired.

Question:

You should have an early night. You don’t feel tired.

• A.
  You should have an early night so as not to feel tired.
• B.
  You should have an early night because you don’t feel tired.
• C.
  You should have an early night and you don’t feel tired.
• D.
  You don’t feel tired so you should have an early night.