Explanation:

- Option 1: Vijender Singh

- Vijender Singh is the correct answer. He won a bronze medal in the middleweight (75 kg) division at the 2008 Beijing Olympics, becoming the first Indian boxer to win an Olympic medal.

- Option 2: Mary Kom

- Mary Kom is an acclaimed Indian boxer but did not compete in the 2008 Olympics. She has multiple world championship titles and later won an Olympic bronze in 2012.

- Option 3: Akhil Kumar

- Akhil Kumar was also part of the Indian boxing team at the 2008 Olympics but did not win a medal.

- Option 4: Jitender Kumar

- Jitender Kumar competed in the 2008 Olympics as well, but he did not secure a medal.