In an informative/explanatory article about party planning, the concept that would be used to explain something to the reader is D. menu planning, or what to do in order to create the perfect menu for the party.
Answer: Anna Quindlen's claims - we are all different, but we are always united as a country and I don't think so some of the sources about her were made years ago. I do not claim this answer as mine and it belongs to their rightful owner(s). I copied and pasted your answer onto Google and edited a little..Hehe, I guess it's incorrect in *some* ways. ^_^" <3
Explanation:
I think it means find things from their work that make them unique or stand out. Try to look for something they do that no one else does.