What Did Buddhism and Christianity Have in Common

What did Buddhism and Christianity have in common?

A) They both ultimately died out in the land of their birth as their ideas were absorbed into other religious traditions.
B) They both started out as an effort to reform the religions from they which they had come but soon emerged as separate religions.
C) They were both associated with a particular people and territory,and denied salvation to outsiders.
D) Neither ever became an active missionary religion and did not spread widely beyond the region of their birth.