Which of These Was One of the Primary Reasons Europeans

Which of these was one of the primary reasons Europeans supported expansion during the 15^th century?

A) They were looking for investment opportunities due to the increased wealth of the European middle class.
B) They hoped to prove to the Muslims and Turks that the earth was round.
C) They needed someplace to send their criminals due to the increase in crime.
D) Men of ordinary birth were looking for ways to enhance their social mobility.