Final answer:
Jassa Singh Ahluwalia led the attack to liberate Amritsar in 1748. Guru Tegh Bahadur executed by Aurangzeb belonged to the Sikh faith, and the 1919 event at Amritsar was the Jallianwala Bagh massacre where British Indian Army troops fired on protesters.
Step-by-step explanation:
The attack on Salabat Khan to liberate Amritsar from under his control in March 1748 was led by Jassa Singh Ahluwalia. A prominent figure in Sikh history, Jassa Singh Ahluwalia played a crucial role in the Sikh resistance against foreign rule and was key to the establishment and consolidation of the Sikh Confederacy during the 18th century. The correct answer to the student's question is option (a) Jassa Singh Ahluwalia.
Aurangzeb executed Guru Tegh Bahadur, who was the leader of the Sikh religion. Therefore, the correct answer to the related historical question provided is (a) Sikh.
In 1919 at Amritsar, specifically on April 13, British Indian Army troops fired on Indian protestors who were gathered to protest the Rowlatt Act. This tragic event is known as the Jallianwala Bagh massacre, and therefore the correct answer to what happened at Amritsar in 1919 is (b) British Indian Army troops fired on Indian protestors.