Explanation:

- The magazine Sudarshan Chakra was edited from Lahore during the pre-independence period by a prominent Himachali revolutionary.

- Yashpal (Option 1) was a famous revolutionary and writer from Himachal Pradesh. He is well known for his involvement in the independence movement and for editing Sudarshan Chakra.

- Inderpal (Option 2): There is no notable evidence of his association with Sudarshan Chakra.

- Sher Jung (Option 3): Sher Jung was a freedom fighter but not linked to editing this particular magazine.

- Swami Krishana Nand (Option 4): Known for spiritual work, not for editing revolutionary magazines.

Correct Answer:

- Option 1: Yashpal