17. Parents who wish to provide a strong foundation for the musical ability of their children should provide them with a good musical education. Since formal instruction is often a part a good musical education, parents who wish to provide this strong foundation need to ensure that their children receive formal instruction.
The reasoning is most vulnerable to criticism on the grounds that it fails to that
(A) parents might not be the only source of a child's musical education
(B) some children might not be interested in receiving a strong foundation for their musical ability
(C) there are many examples of people with formal instruction whose musical ability is poor
(D) formal instruction might not always be a part of a good musical education
(E) some children might become good musicians even if they have not had good musical educations 答案是d 可是我觉得e好像才是最合适的啊,怎么回事呢