Final answer:
The major rivers in Southeast Asia run from north to south primarily because of the region's topography and mountain ranges. The paths of these rivers are influenced by the barriers created by mountain ranges and the paths of least resistance.
Step-by-step explanation:
The major rivers in Southeast Asia run from north to south primarily because of the region's topography and mountain ranges. This topographic feature directs the flow of rivers in a north-south direction. The mountain ranges act as barriers, causing the rivers to flow along the path of least resistance, which is typically from north to south.
For example, the Mekong River, one of the major rivers in Southeast Asia, originates in the Tibetan Plateau in China and flows southward through several countries before emptying into the South China Sea. The river's path is influenced by the mountain ranges that it encounters along its course.
In addition, the answer choices b) and d) are also partially correct. Tectonic plate movements can create or influence the formation of mountain ranges, which in turn affect the direction of river flow. Seasonal monsoon winds can also play a role in determining the flow direction of rivers in Southeast Asia, as they can cause heavy rainfall and affect the river's water level and course.
Learn more about Rivers in Southeast Asia