What did european slave traders do to get more slaves once they realized it was not practical to kidnap the number of african people they needed?

a) they fueled rivalries between tribes and suggested that tribal leaders to sell prisoners of war

b) they gradually abandoned the slave trade and went in search of another commodity

c) they hired arab soldiers to attack entire villages and round up all of the young men

d) they began to look for other cultures in india and asia as a source for slaves