Guru Nanak, like the Hindus, believed in reincarnation and Karma. So, option b. is correct. Guru Nanak (1469-1539) was one of the greatest religious innovators of all time and the creator of the Sikh religion.
Nanak's religious ideas are produced on both Hindu and Islamic thought but are far more than just a synthesis. Nanak was an original spiritual thinker and conveyed his thoughts in extraordinary poetry that forms the basis of Sikh scripture.
His family were Hindus, but Nanak soon manifested an advanced interest in religion and studied Islam and Hinduism extensively. As a child, he indicated significant ability as a poet and philosopher. He worked for a while as an accountant but while still fairly young decided to accord himself to spiritual matters.
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