The correct description of the process of impeachment is:
By a simple majority, the House of Representatives must vote for the impeachment of a federal official. The Senate then holds a trial.
Impeachment begins in the House of Representatives, where a simple majority vote is required to impeach. If the House votes to impeach, the case then moves to the Senate, which conducts a trial. A two-thirds majority in the Senate is required for conviction and removal from office.