The correct option is C 1539 A.D.
Guru Angad born as Bhai Lehna the second of the ten Sikh gurus. His discipleship was subjected to various tests by Guru Nanak Sahib after which he came to be known as the the symbol of obedience and service to humanity. Guru Nanak renamed him as Angad, and installed him as his successor on 13 June 1539.