Option b is the correct answer. The regime under which Guru Nanak Dev founded Sikhism was that of Sikandar Lodi, who was the Sultan of Delhi from 1489 to 1517 . Sikandar Lodi belonged to the Lodi dynasty, which ruled over most of northern India from 1451 to 1526. Important Tips Significant teachings of Sikhism: Sikhs believe in one universal God, who is formless, timeless, and present in all things. Sikhs also follow the teachings and examples of ten human Gurus, who were spiritual leaders and guides for the Sikh community. The last Guru, Guru Gobind Singh, declared that the Guru Granth Sahib, the holy scripture of Sikhism, would be the eternal Guru for Sikhs. Sikhism teaches that human beings are trapped in a cycle of rebirth due to their ignorance and attachment to worldly things. The goal of Sikhism is to attain liberation from this cycle by realizing one's true identity as a soul that is part of God. This can be achieved by following the path of devotion (bhakti), service (seva), and ethical conduct (rahit).