Try using the expository format if not try function function negation paragraphs, but i suggest asking a teacher for the format first, and if any of them are ok.
C. He as a subject because it's in the beginning of a sentence, and a sentence always have to start with a subject
Ecological metaphors are used to help develop authors ideas to communicate them to public
The would be a because it makes more sense than the other sentences. If you read each of them a will make better sense.
