What is one of the most important beliefs in buddhism?

The belief that there is in fact an afterlife.

Explanation:

Buddhism is a religion and a philosophy according to which we seize the sense of existence only through leading an awaken and moral life. This is the only way to attain Nirvana, a state of disconnection from the material life and all of its vices.

Man is destined to wander, from one life to another, until he fulfills this quest. Buddhism believes in incarnation but only those who have not been enlightened are born again, granted with a new chance.

Karma is also a crucial element of the Buddhist philosophy - everyone sooner or later faces the consequences of their actions, good or bad.

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explanation:

c) they were beaten and fired from their jobs.