Why Did the Earliest of the Japanese Military Centralizers Accept

Why did the earliest of the Japanese military centralizers accept Christian missionaries?

A) His wife was a Christian who was able to exert her influence throughout his household.
B) The Portuguese supplied a large army to rulers who offered to accept Christianity.
C) Christianity was seen as a counterforce to the Buddhist orders that opposed the imposition of central rule.
D) Prior to his first military victory, Nobunaga saw a cross in the sky.