如果题目回忆得没错的话,应该选更motivated. 原因是the question is talking about the "gains" in knowledge, so even if long-distance students have learnt in-class before, they are just likely to have a higher start point and higher end point than in-class students. However, the gains (i.e. distance between start point and end point) are not necessarily larger. The same logic applies to option 3.