I'm failing and I don't know why

1. Do you do your work?

2. Do you get good grades on the work?

answer; /// i believe that the correct answer is (c) the concentration of active ingredients in a medication

precisely the author keeps the interest of readers not describing clearly the   kind of relationship in giselle's family. by doing this, readers had to imagine and assume how it was.   instead, the author described better scenes with dark star and the influence of books about horses in giselle's life and actions.   also the fact that she broke her arm but not referring to it in detail leads the readers to imagine and guess what could have occurred.