Answer:
the topic would be medium of exchange and the main idea is basically the author's message about the topic, it can be expressed directly or implied. So in this case the main idea would be that medium of exchange have changed their ways of trading or bartering for the better making it way easy.
hope i helped, if i didn't i'm sorry and good luck! :)
A paragraph is a collection of related sentences dealing with a single topic. Learning to write good paragraphs will help you as a writer stay on track during your drafting and revision stages. Good paragraphing also greatly assists your readers in following a piece of writing. You can have fantastic ideas, but if those ideas aren't presented in an organized fashion, you will lose your readers (and fail to achieve your goals in writing).
D. would make the most sense because you can't start a sentence with both for letter B. Hailey and me for letter C would not make any sense either, the correct response here would be Hailey and I. For Letter A, never start with a transition word unless it starts with, Then,.....
The correct answer is D
