Hurry pls help give brainleist

A. Because...

The best example of checks and balances is that the president can veto any bill passed by Congress, but a two-thirds vote in Congress can override the veto.

Other examples include:

The House of Representatives has sole power of impeachment, but the Senate has all power to try any impeachment.
Any bills that intend to raise revenue must originate in the House of Representatives, but the Senate also has to approve the bill.
Congress has the power to set and collect any taxes or duties.
The president is commander-in-chief of the U.S. Army and Navy.
The president has the power to grant pardons and reprieves for crimes against the U.S. except in an impeachment.
The president can make treaties, but only with a two-thirds agreement from the Senate.
The House of Representatives and the Senate both have to pass the same bill before it can become a law.
The president can appoint Supreme Court judges, but the Senate must approve these choices.
Supreme Court judges have the power to declare presidential actions as unconstitutional.
The vice president is also automatically the president of the Senate.
Congress can amend the Constitution, which means they can override a Supreme Court decision