A. Leroy is the subject of the sentence
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The answer would be C.~! ^.^
Hey!
I know this is too late for you but hopefully it will be able to help future users.
The correct answer is: People and the environment will benefit if smoke-producing stoves are replaced with clean stoves and fuels.
I just took the test so I guarantee it!
A screenshot is attached :)
I hope that helps! Good luck!