Explanation:

- Option 1: Zorawar Singh

Zorawar Singh was a military general serving under Maharaja Gulab Singh of Jammu and Kashmir, known for his campaigns in Ladakh and Tibet.

- Option 2: Shyamji Krishna Varma

Shyamji Krishna Varma was an Indian revolutionary and nationalist who played a significant role in the Indian independence movement. He was not connected to Mahant Pyarelal's murder.

- Option 3: Kesaii Singh Bairha

There are no widely known records or references connecting Kesaii Singh Bairha to the Mahant Pyarelal Murder case in historical texts or popular sources.

- Option 4: Vijay Singh Pathik

Vijay Singh Pathik, also known as Bhoop Singh, was an Indian revolutionary who was associated with the Mahant Pyarelal Murder case during the British colonial period.

Option 4: Vijay Singh Pathik is the correct answer.