The correct option is C He wanted to unite Hindu and Muslim.
Guru Nanak's first words following enlightenment were that both Hindu and Muslims are equal in the eyes of God. There is no disparity between them as they are humans. He also spoke against issues like caste system which troubled both Hindus and Muslims. Due to his will to unite Hindus and Muslims, he is known as Guru Nanak Shah Fakir; a guru for Hindus and a Pir for Muslims.