The correct option is D They were sons of Guru Nanak Dev Ji
Guru Nanak Dev was born on 13 April 1469 to Mata Tripta and Mehta Kalu in Talwandi, a village in the Sheikhupura district, to the west of Lahore. He was the founder of Sikhism and the first Guru of the Sikhs. He married Mata Sulakkhani in 1487. They had two sons named Sri Chand in 1494 and Lakhmi Das in 1497.