How did the arrival of European missionaries and merchants to Japan in the mid-1500s CE affect the civil wars being fought at that time between the daimyo?

It ended the fighting as the Europeans introduced new diseases on the Japanese islands and the indigenous population died out.

It had no effect whatsoever.

It ceased the fighting as the Europeans converted the daimyo to Christianity and emphasized a peaceful existence with one's neighbors.

It intensified the fighting as the Europeans brought firearms.