What is the key belief in buddhism? a) the cause of all suffering is desire. b) relationships between people must be mutual. c) only through reincarnation can a person become a brahman. d) a person can escape conflicts by becoming one with nature

i think is a - the cause of all suffering is desire.  because The Second Noble Truth says that Desire and attachment are the causes of unsatisfactoriness and suffering.

A) The cause of all suffering is desire.

Explanation:

Buddhism is a non-theistic "philosophical and spiritual doctrine" belonging to the Dharmic family, derived from Brahmanism and Vedism. It comprises a variety of traditions, religious beliefs, and spiritual practices primarily attributable to Buddha Gautama. Buddhism originated in India between the sixth and fourth centuries BCE, from where it extended to much of East Asia and declined its practice in its country of origin during the Middle Ages.

The fundamental teaching of Buddhism explains the nature of the phenomena of the perceived world, which have three universal characteristics:  

-Anitya: impermanence, transience or change.

-Anātman: insubstantiality (non-existence of a permanent ego).

-Duḥkha: suffering, dissatisfaction or dissatisfaction.

Duhkha is the central concept of Buddhism and is translated as the "inability to satisfy" and suffering. Life is imperfect, dissatisfaction and suffering exist and are universal. This is the starting point of Buddhist practice. This truth contains the teachings on the Three Marks of Existence. Birth is suffering, disease is suffering, old age is suffering, death is suffering, grief is suffering, as well as lamentation, pain and despair. The contact with the unpleasant is suffering, the separation from what is pleasant is suffering, the unsatisfied desire is suffering. In short, the five aggregates of the mind and body that produce desires (bodily, feeling, perception, predisposed mental formations and discriminatory consciousness) are suffering.

The basic orientation of Buddhism expresses that we crave and cling to temporary situations and material things. This puts us in the state of Samsara, the cycle of repeated rebirths and death. We want to achieve happiness through situations and material goods that are not permanent and, therefore, we do not achieve true happiness. But we can free ourselves from this infinite cycle by achieving the state of Nirvana (spirituality) through the Way of Eight Noble Practices.

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.

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