The correct answer is option 'A', Bangladesh.

Explanation:
Bangladesh is a country located in South Asia. It is known for its rich cultural heritage and historical landmarks. One of the most famous landmarks in Bangladesh is the triangular-shaped pyramid with a broad base, known as the Boro Shona Mosque.

Boro Shona Mosque:
The Boro Shona Mosque is located in the village of Chapai Nawabganj in Bangladesh. It was built in the 15th century during the reign of Sultan Ruknuddin Barbak Shah, who was a ruler of the Bengal Sultanate. The mosque is also known as the Great Golden Mosque because of its golden exterior.

Architecture:
The Boro Shona Mosque is a unique example of Islamic architecture in Bangladesh. It is a triangular-shaped pyramid with a broad base, which is a rare feature in Islamic architecture. The mosque is made of brick and terracotta and is decorated with intricate carvings and designs.

The mosque has three domes on top of the triangular structure, which are also decorated with intricate designs. The interior of the mosque is also decorated with beautiful carvings and designs.

Conclusion:
In conclusion, Bangladesh is the country that has a triangular-shaped pyramid with a broad base, known as the Boro Shona Mosque. The mosque is a unique example of Islamic architecture and is a popular landmark in Bangladesh.