Someone pls answer this for a heart and brainlist Which quotation from the United States Constitution includes an example of separation of powers?

A.
“No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.”
B.
“The President . . . may require the Opinion, in writing, of the principal Officer in each of the executive Departments . . .”
C.
“No State shall, without the Consent of the Congress, lay any Imposts or Duties on Imports or Exports . . .”
D.
“Every Bill which shall have passed the House of Representatives and the Senate, shall, before it become a Law, be presented to the President of the United States . . .”