If the president vetoes a bill, it can still become law if congress overrides the president's veto with a majority

supermajority

Explanation:

The U.S. Constitution grants the President of the United States the power to veto to bills passed by both houses of Congress. A vetoed bill can still become law if Congress overrides the president’s action by obtaining a supermajority vote of two-thirds of the members of both the House (290 votes) and the Senate (67 votes).

d.

many people believed they were convicted solely because they were anarchists.