It's true because, It's listing things. Comma's are mianly used for listing certain things.
If you are talking about this website, then A Forum for Publishing.
If you are talking about your actual question with the answers underneath, it would be none of the above.
I think you might be missing a link or a picture though.
Answer:
b
Explanation:
it's always placed besides words of equal rank!
D. She called us My Boys and that really meant something to us
Answer:
Ideas that the author most wants readers to know.
Explanation:
Since this is an informational text, the key ideas would be what the author most wants readers to know.
