What was the great (western) schism of 1378 ce?
a conflict between asian leaders and european kings that resulted in new trade routes
a conflict between the french king and the pope that resulted in two rival popes
a dispute over corruption in the papal court during the “great hunger”
a dispute over merchant and artisan labor rights after the black death

The answer is the second option or, "A conflict between the French king and the pope that resulted in two rival popes ."

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.