It was the boy with the flying shoes not percy and he stole ummm zeus lightning bolt when they were there in the summer or something
The front page of a newspaper, would most likely be the best, because so many people read newspapers these days. Its highly likely, many people will be able to see your ad first thing.
When you do math you are adding, rooting, graphing etc. When you are doing social studies you are studying people and population. It can also be about geography and how people live today. You are being social.
I agree the answer is "C" It typically has multiple themes that are explored more deeply.