The two communities that combined to form Hinduism is Vedism and native cultures. Thus option (A) is correct.
Hinduism is one of the popular religion cultural heritage that originated with Vedic religion and is found in South Asia. The religion believes in the birth, death and reincarnation and is the firm believer of the Karma.
The Religion was formed 4000 years ago and the Indus Valley tradition and Vedic gods and beliefs led the foundation of the Hinduism.
Therefore, the correct option is (A).
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