Answer: Impeachment
Reason:
A filibuster is when a senator uses an action to prolong a debate for the purpose of delaying or preventing a vote on a bill.
Impeachment is when a official (in the senate, House, or the President) commits a crime or acts improper
Override is when one person is more powerful than another and can ‘overrule’ the decision of the first person. Like when Congress can override a presidential veto
Pardon is kinda like a get out of jail card from monopoly. The president gives an official pardon and the person pardoned is exempted from punishment. Like when Lincoln pardoned all the deserters in the Civil War.