Explanation:

- Option 1: Magpai

- Magpies are known for their intelligence and are found in various parts of the world. However, they are not the national bird of Bhutan.

- Option 2: Parrot

- Parrots are colorful birds popular in many tropical regions. They are not associated specifically with Bhutan as a national symbol.

- Option 3: Raven

- Correct Answer

- The raven is the national bird of Bhutan. Revered in Bhutanese culture, the raven is considered a symbol of protection and is featured on the royal crown. It holds historical and religious significance, often associated with Mahakala, a protective deity in Buddhism.

- Option 4: Peacock

- Peacocks are known for their vibrant feathers and are significant in various cultures, including India where it is the national bird, but not in Bhutan.

The raven's prominence in Bhutanese symbolism and tradition makes it the representative bird of the nation.