Correct option is C
The correct answer is option (c).
The entire passage focuses on the extreme drought that has hit the Amazon region, the low water levels recorded, its impact on people, wildlife, and the environment. It also touches upon the causes such as El Niño and global warming, but the central theme remains the
worst drought conditions experienced in the Amazon in over a century.
Other options are incorrect because:
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(a) focuses only on El Niño, which is a contributing factor but not the main topic.
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(b) is partially true, but the passage is broader than just ecosystem damage.
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(d) focuses only on people, while the passage also includes environmental and climatic aspects.