Final answer:
Guru Tegh Bahadur Ji had one son named Gobind Rai, who later became known as Guru Gobind Singh Ji, the tenth Sikh Guru. Guru Tegh Bahadur was executed by the Mughal Emperor Aurangzeb and was a significant figure in the Sikh religion.
Step-by-step explanation:
Guru Tegh Bahadur Ji, the ninth Sikh Guru, had one son. His name was Gobind Rai, who would later become known as Guru Gobind Singh Ji, the tenth Sikh Guru. Therefore, the correct answer to the question of how many children Guru Tegh Bahadur Ji had and their names is: A. One son. Gobind Rai later became Guru Gobind Singh Ji. As the leader of the Sikh religion, Guru Tegh Bahadur Ji was known for his contributions to Sikhism and for his martyrdom. He was executed by the Mughal Emperor Aurangzeb, a fact that underscores the turbulent relationship between the Sikh community and the Mughal authorities of the time. Guru Tegh Bahadur's legacy continued through his son, Guru Gobind Singh Ji, who made significant contributions to the faith, including the establishment of the Khalsa in 1699.