**Explanation:**

The Tsangpo River, also known as the Yarlung Tsangpo River, is the other name in Tibet for the **Brahmaputra River**. Here is a detailed explanation of this answer:

**1. Tsangpo River:**
- The Tsangpo River is a major river in Tibet, originating from the glaciers of the Kailash Range and running through the Himalayas.
- It is one of the longest and largest rivers in Asia, with a total length of about 2,900 kilometers (1,800 miles).
- The Tsangpo River flows through Tibet, India, and Bangladesh, where it eventually joins the Ganges and Meghna rivers to form the world's largest delta, the Sundarbans Delta.

**2. Alternative Names:**
- In Tibet, the Tsangpo River is commonly referred to as the **Brahmaputra River**.
- The name "Brahmaputra" is derived from the Sanskrit words "Brahma" (the Hindu god of creation) and "putra" (son), symbolizing the divine origin and significance of the river.
- The name "Brahmaputra" is more commonly used in India and Bangladesh, where the river flows through major cities like Guwahati and Dhaka, respectively.

**3. Importance and Significance:**
- The Tsangpo/Brahmaputra River is of immense importance to the regions it passes through.
- In Tibet, it is considered a sacred river and is an integral part of Tibetan culture and mythology.
- The river is a lifeline for millions of people in India and Bangladesh, providing water for agriculture, transportation, and hydropower generation.
- The Brahmaputra River basin is known for its rich biodiversity and is home to various endangered species, including the Gangetic dolphin and the Bengal tiger.

**4. Challenges and Opportunities:**
- The Tsangpo/Brahmaputra River also presents several challenges and opportunities.
- The river is prone to frequent flooding, causing significant damage to lives and property in the downstream areas.
- However, it also offers immense potential for hydropower generation, with several dams and hydroelectric projects being planned and implemented along its course.

In conclusion, the correct answer to the question is **c) Brahmaputra**. The Tsangpo River is the other name in Tibet for the Brahmaputra River, which flows through Tibet, India, and Bangladesh, playing a vital role in the lives of millions of people and the ecology of the region.