The correct answer would be the third one.
"It would benefit many people to learn how to help protect our environment."
It has a professional tones and uses grammatically correct words.
I hope this helped!
Answer: The answer here is a Compound Sentence.
Explanation: A Compound Sentence is simply two sentences in one. If you take away the FANBOY (Coordinating Conjunction) out of the sentence, you're left with two separate and complete simple sentences.
Answer:
It may not be a cloudy day
This may be the answer
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4 is the answer ♂️♂️♂️♂️ any questions please