Group study is beneficial to get confidence in a particular subject. The studying in a group helps in completing the notes or filling up the information which has been missed during any lecture. The group study helps to recall the concepts or lessons in the previous class, it helps to learn faster, sharpens the memory and breaks the monotony of studying alone.
Thus if one achieves confidence over a particular subject one is likely to get good scores or grades.
C, details that help readers visualize the settings better. A wouldn't work because it doesn't help the setting, B doesn't help the setting either and D would only add more confusion so UT would have to be C by process of elimination.
