The Pope Called for a Crusade to Root Out the Cathars

The pope called for a crusade to root out the Cathars because they

A) had attracted a large following and the pope believed they were heretics.
B) had refused to support the pope's efforts to spread Christianity in Africa.
C) were secretive and reclusive and the pope felt they were suspicious.
D) rejected the spiritual aspect of mankind.
E) had become too powerful in northern France.