Final answer:
Guru Tegh Bahadur Ji had one son named Gobind Rai, who later became Guru Gobind Singh Ji, the tenth Sikh Guru.
Step-by-step explanation:
Guru Tegh Bahadur Ji had one son, who is known by the name Gobind Rai. Later in life, Gobind Rai became the tenth Sikh Guru and is better known as Guru Gobind Singh Ji. This answer corresponds to option C in the question given. Guru Tegh Bahadur was the ninth of the Sikh Gurus, and he played a crucial role in protecting the freedom of religion in India during a time when the Mughal emperor Aurangzeb persecuted many non-Muslims. As a religious leader of the Sikh faith, Guru Tegh Bahadur was executed by Aurangzeb for refusing to convert to Islam.