What role did the Popes play in the Crusades?

They discouraged Crusaders from killing more infidels than was necessary to take control of Jerusalem.
They traveled to Jerusalem with the Crusaders and helped plan most of the attacks on Jerusalem.
They ordered or approved the Crusades and told knights it was God’s will to kill people who were not Christians.
They provided the money required to train knights and feed them on their long journeys.