The correct answer is option 'C' - Brahmaputra.

Explanation:
The Brahmaputra River is associated with the creation of the largest delta in the world before entering the Bay of Bengal. Let's explore the details about the Brahmaputra River and its delta.

- The Brahmaputra River, also known as the Tsangpo-Brahmaputra, is one of the major rivers in Asia.
- It originates in southwestern Tibet and flows through China, India, and Bangladesh before entering the Bay of Bengal.
- The river is approximately 2,900 kilometers long, with a drainage basin spanning about 651,334 square kilometers.
- It is a transboundary river, meaning it flows through multiple countries.
- The Brahmaputra River is known for its high sediment load, which contributes to the formation of a large delta.

The Brahmaputra Delta:
- The Brahmaputra River forms the largest delta in the world before entering the Bay of Bengal.
- The delta is primarily located in Bangladesh, covering a vast area.
- It is known as the Brahmaputra Delta or the Ganges-Brahmaputra Delta.
- The delta is formed by the deposition of sediment carried by the river over thousands of years.
- The sediment deposition creates a network of distributaries and channels, forming a complex and dynamic deltaic landscape.

Key Points:
- The Brahmaputra River is associated with the creation of the largest delta in the world before entering the Bay of Bengal.
- The Brahmaputra Delta, also known as the Ganges-Brahmaputra Delta, is primarily located in Bangladesh.
- The delta is formed by the deposition of sediment carried by the river over time.
- The Brahmaputra River is known for its high sediment load, contributing to the formation of the large delta.

In conclusion, the Brahmaputra River is the correct answer as it is associated with the creation of the largest delta in the world before entering the Bay of Bengal. The sediment carried by the river over thousands of years has led to the formation of the vast and dynamic Brahmaputra Delta in Bangladesh.

The Brahmaputra River, along with the Ganga, forms the largest delta in the world before entering the Bay of Bengal. This delta is characterized by its extensive network of distributaries and islands, including the Sundarbans.