a. Taiga forest
b. Tundra forest
c. Amazon rain forest
d. Rain forests of North East India
Answer: c. Amazon rain forest
Explanation: The Amazon’s Tropical Rainforest is known as the planet ‘lungs’ because they are responsible for producing about 20% of the world’s oxygen. They remove large amounts of carbon dioxide from the air and release oxygen. So, the correct answer is ‘Amazon rainforest’.