Explanation:

The correct answer is option 'D' - Bhagat Singh, Sukhdev, and Rajguru were not tried in the Meerut Conspiracy case.

Explanation:

Delhi-Lahore Conspiracy:
- The Delhi-Lahore Conspiracy was a revolutionary conspiracy organized by Ras Bihari Bose, an Indian revolutionary leader.
- The conspiracy aimed to overthrow British rule in India through armed revolution.
- The main objective of the conspiracy was to assassinate the Viceroy of India, Lord Hardinge, during his visit to Delhi.
- The conspiracy was exposed and several revolutionaries were arrested, but Ras Bihari Bose managed to escape to Japan.

Chittagong Armoury Raid:
- Surya Sen, also known as Masterda, was one of the leaders of the Chittagong Armoury Raid.
- The Chittagong Armoury Raid was a daring attack on the British armory in Chittagong, Bengal, in 1930.
- The raid was carried out by a group of revolutionaries known as the Jugantar Party.
- The aim of the raid was to capture weapons and ammunition to carry out an armed uprising against British rule.
- Although the raid was successful in capturing the armory, it failed to achieve its larger objective of starting a widespread rebellion.

Yugantar Group:
- The Yugantar group was a secret revolutionary association operating in Bengal during the early 20th century.
- The group was formed by Aurobindo Ghosh and his brother Barindra Ghosh.
- The Yugantar group aimed to liberate India from British rule through revolutionary means.
- The group carried out several acts of sabotage, including bomb attacks and assassinations, targeting British officials.
- However, the group was eventually infiltrated by British spies and many of its members were arrested and executed.

Meerut Conspiracy Case:
- The Meerut Conspiracy case was a prominent trial held in 1929-1933.
- It involved the prosecution of several Indian communist leaders who were accused of conspiring to overthrow British rule in India.
- The accused included prominent communist leaders like Shaukat Usmani, Muzaffar Ahmed, and S.A. Dange.
- The trial took place in Meerut, Uttar Pradesh, hence the name.
- Bhagat Singh, Sukhdev, and Rajguru were not involved in the Meerut Conspiracy case.
- They were part of the Hindustan Socialist Republican Association (HSRA) and were involved in other revolutionary activities, including the Lahore Conspiracy case and the assassination of British police officer J.P. Saunders.