I believe the answer is: Brief Example.
Brief example refers to a short statement that aimed to support relevancy of the speakers' main point.
In public speaking, brief example shall not be longer that five minute and is aimed to hooked audience attention to the main topic.<span />
The correct option is (A), The Three Gorges Dam. The Three Gorges is the world biggest power plant, the biggest dam, and consumer of stone, dirt, steel, and concrete. The three gorges dam will cause serious environmental pollution, such as water pollution, erosion, air pollution etc. Particularly the river Brahmaputra will be the most affected. The Brahmaputra river is the most important for India because of water resources. So, it would have the biggest impact on the interaction between India and China.
