Samurai and Knight: were the similarities greater than the differences

There were more similarities than differences as both of them were members of military class, whose main obligation was to serve the ruler. They were both included in a system known to us as feudal system.

Explanation:

As we said both in Japan and Europe feudal system was functioning for a long period of time. They both had to participate in military campaigns when called upon by their ruler. Also, they both respected certain codes, known as bushido among samurais and code of chivalry. It is interesting that we have examples of samurai and knights being women.

answer; i believe that the correct answer is (the explosion of a nearby star(supernova);

a is the answer i believe.