Answer C has subject/verb agreement: Wasn't that rainbow after the thunderstorm just lovely?
Answer: john was running down then street when his ice cream fell in mud.
When looking in the library several books about horse can be found.
While flipping through his telephon dicionary he finally found the name he was looking for.
While eating a breakfast one morning the idea came to him.
while picking up the pencil he notices toms shoes were untied.
Explanation:
I'd say it means that the person who recieved the comment, is different. That person might be a good student or a impressive writer for example.
In general "distinghuishing" is something that makes a person distinct and~different from others, usually in a positive way.
Hope it heled,
Happy homework/ study/ exam!