It is impossible to build a drainage system on the outside of the Sao Francisco river as buildings are built on the outside of the foundation.
The Subarnarekha is developing a small drainage system.
The Amazon basin is the largest drainage basin in the world.
The Urugay drainage system includes the greater part of southeastern Brazil, Paraguay, southeastern Bolivia and northern Argentina
So i would suggest putting the Amazon as it is the most common known and largest. Remember to use geographical terms!
The correct answer is (c.) troposphere
The troposphere is the lowest portion of the atmosphere but also it is where most gas particles are located. It holds 75 percent of the atmosphere's mass. It is typically a hundred meters deep to 2 km. Above the troposphere is the tropopause, bordering between troposphere and the stratosphere.
Answer: [B]: the Orange River .
_________________________________________
