Difference between buddhism and zen

Buddhism is a religious, philosophical and spiritual doctrine and has as its precept the reincarnation of the human being in order to bind us to the sufferings of the material world.

The name Zen is the name attributed to a Japanese philosophy (Ch'na) that had its origin in China around the 7th century and was then taken to the land of the rising sun. There is an association of Zen Buddhism with the Buddhist strand known as Mahayana. The basis of this strand is in the so-called zazen that would be in free translation "meditate seated".

the first question's answer is a.