Consider the following countries: 
1. Argentina
2. Brazil 
3. Ecuador 
4. Peru
Which of the above share the Amazon river basin? 

Answer: [C] Only 2, 3 & 4

Amazon Basin covers almost 40% of the South American continent and it is shared by eight countries viz. Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, Suriname and Venezuela. 

This question is a part of GKToday's Integrated IAS General Studies Module