Since its a sibling, and siblings tend to be in a person's close circle of people, informal speech is used.
Mercantilism was a form of economy used by British citizens to make money be selling exports to enrich their motherland.
The answer is A, your attitude toward your subject.
Hope that helps you! :)
A. is the answer
Mentioning that she had red hair was a much more descriptive answer than any of the others.
