Grace goes to the doctor. The doctor tells Grace that while her chronological age is 24, her physiological age is 30. What factors could account for this discrepancy?

answer; /// i believe that the correct answer is (d); /// alternate walking and running;

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.