Option c is the correct answer. Guru Nanak Dev Ji, the founder of Sikhism, propagated the idea of the equality of all human beings before the Divine. He emphasized that God judges individuals based on their virtues and actions rather than their caste or social status. Guru Nanak's teachings challenged the prevailing caste system and social inequalities, advocating for a society where all individuals are treated with respect and love, regardless of their background. The concept of the casteless society and the recognition of the inherent worth of every individual are fundamental principles in Sikhism. Important Tips Guru Nanak Dev: Guru Nanak Dev was the founder of Sikhism and the first of the ten Sikh Gurus. He was born on April 15, 1469 in Rai Bhoi di Talvandi, which is now Nankana Sahib in Pakistan. Guru Nanak Dev emphasized devotion to a single, formless God, equality, social justice, and rejection of divisions. His teachings are encapsulated in the Japji Sahib, outlining his spiritual message in the Guru Granth Sahib. He stressed selfless service ("Seva") and positive societal contributions. He composed many hymns and poems in Punjabi, which are included in the Guru Granth Sahib, the holy scripture of Sikhism. He died in 1539 in Kartarpur, Pakistan.