The Amazon Rainforest is the largest tropical rainforest in the world. It is home to an incredible diversity of plant and animal species, many of which are found nowhere else on Earth. Unfortunately, deforestation is a major threat to this vital ecosystem. The average rainfall in the Sahara Desert is less than 100 millimeters per year. Which sentence is LEAST relevant to the main topic of the Amazon Rainforest?
✓ Correct Answer: Option D
The main topic is the Amazon Rainforest. While the other sentences provide details, facts, or threats related to the Amazon, the sentence about the Sahara Desert introduces an entirely different geographical region and is irrelevant.