Answer:
A. Can vote to remove Supreme Court justices accused of abusing their power
Step-by-step explanation:
The statement that best completes the diagram is "can vote to remove Supreme Court justices accused of abusing their power".
Congress have the power to impeach and convict Supreme Court justices that are found abusing their power. The Constitution does not give a specified number of Supreme Court justices. The Justices are nominated by the President and are confirmed by the Senate. Justices do not run or campaign for re-election but can be voted to be removed by Congress on the abuse of power.