The correct option is D Catherine was just an average dancer
Talking in context to her dance lessons, the passage states her of having a modest figure, meaning her posture wasn't refined, i.e., she was an average dancer. When the statement is ". . . she made but a modest figure", it implies that she made nothing but a modest figure. There isn't any indication of the extremes indicated in the other options. There is no reference to her physical body as stated in option A. The statements of options B,C and D no not fully convey the meaning of the text. Thus, option E is the correct answer.