The correct option is B By asking question about god
Guru Nanak Dev was born on 15 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. At the age of seven, he was sent to a school ran by Pandit Gopal. He asked his teacher the meaning of each alphabet and also asked questions about God. Later, he astonished his teacher with his fluency in explaining deeper truths about man and God and even gave spiritual interpretation to each Punjabi alphabet.