Which scientific study would probably be most useful in predicting worldwide rainfall trends?

Which scientific study would probably be most useful in predicting worldwide rainfall trends?
A . compiling yearly rainfall amounts in different areas of the world
B . analyzing the mineral content of the deserts of the world
C . checking the pH of soil samples on different continents
D . checking soil samples for evidence of radioactivity in predetermined sites
E . studying fossil records of ancient plants that existed in various areas

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Answer: A