Explanation:

- Option 1: Anand Shetty

- Anand Shetty is a name not typically associated with being a sports ambassador for Assam. There isn't much publicized information about him in this role.

- Option 2: Hima Das

- Hima Das is a prominent Indian sprinter from Assam.

- In September 2018, she was indeed appointed as the Sports Ambassador of Assam.

- She gained fame for her accomplishments in athletics, particularly in the 400m sprint.

- Option 3: Tata Shankar

- Tata Shankar does not have any notable connections to being a sports ambassador for Assam.

- This name does not have historical relevance to the current context.

- Option 4: Makhan Singh

- Makhan Singh was a celebrated Indian athlete, known for competing against Milkha Singh.

- However, he was not appointed as the Sports Ambassador of Assam in 2018.