Which statement identifies an economic cause of the Crusades?

Byzantine Emperor Alexios I hoped to find wealth and spices in the Middle East.
Europeans hoped to have their debts reduced.
The Seljuk Turks hoped to capture Jerusalem for its wealth.
The pope hoped to expand the Catholic Church's wealth

The statement "Byzantine Emperor Alexios I hoped to find wealth and spices in the Middle East" identifies an economic cause of the Crusades.