Explanation:

- Option 1: Tejaswin, the Indian sportsman

- This part correctly introduces Tejaswin and provides relevant background information.

- Option 2: the anti-race cause

- The phrase "anti-race" is vague and problematic. Typically, it should be more specific, like "anti-racism cause," which clearly defines the intent to oppose racism.

- Option 3: in the US

- This provides the location of Tejaswin's efforts. It's clear and correctly used here.

- Option 4: is leading

- This phrase correctly depicts the action of Tejaswin, indicating he is taking a leadership role.

Correct Answer: Option 2 – the anti-race cause