Explanation:

- Option 1: Bengali

- Bengali is an Indo-Aryan language spoken predominantly in Bangladesh and the Indian states of West Bengal, Tripura, and Assam.

- It is not the official language of China.

- Option 2: Burmese

- Burmese is the official language of Myanmar.

- It is not used officially in China.

- Option 3: Sinhala

- Sinhala is an Indo-Aryan language primarily spoken in Sri Lanka.

- It is not an official language in China.

- Option 4: Mandarin

- Mandarin is the official language of China.

- It is part of the Sino-Tibetan language family and is widely spoken across the country.

Your Answer: Option 4 - Mandarin

- This is indeed the correct answer.