Explanation:

- Option 1: 55 kg

- This category is for athletes lifting between 50 kg and 55 kg.

- Mirabai Chanu did not compete in the 55 kg category at the Tokyo Olympics 2020.

- Option 2: 49 kg

- Chanu bagged a silver medal in this category.

- She lifted in the women's 49 kg weight class, showcasing her strength.

- Correct Answer: Option 2 - 49 kg.

- Option 3: 64 kg

- This is a higher weight class, not related to Chanu's participation.

- She did not compete in or win a medal for this category.

- Option 4: 59 kg

- This category did not include Chanu in the 2020 Tokyo Olympics.

- She focused on the lighter 49 kg division.

Mirabai's achievements in the 49 kg category brought her fame and recognition.