题目内容：
根据下面资料，回答题 Bill and his family have been living in the same old building for eight years．The landlord (房东)alsolives there,and usually all the tenants(房客) get along fairly well with one another．Recently, however,there has been a change in their relations．
A nice, quiet old couple used to live there, too．The old lady would sometimes bring some smallcakes she made to Bill' s mother, who in return would give her some meat or help her with shopping．Unfortunately, the old lady died last month．As her husband couldn' t live alone, his grandson moved in．
The grandson,a youth of about twenty, has become a problem to Bill' s family because he is sonoisy．Bill' s family members were used to peace and quiet, but the youth likes to listen to his radio lateat night．Sometimes his friends came for a visit, and they also made a lot of noise．Everyone in Bill' sfamily has been bothered by the new comer and getting angry．
Bill' s mother once politely asked the old man if he was able to sleep well at night, but it seemedthat he didn' t understand what she meant and so never spoke to his grandson about it．If he did, thegrandson apparently didn' t listen, since things have not changed any．Everyone in Bill' s family agreesthat something has to be done, but no one wants to hurt the old man' s feelings or cause him any
problems．
What do you think should be done?
Bill' s family got angry with their neighbor because________． A．the old lady died
B．a young man moved in
C．the grandson made a lot of noise
D．the young man could not live alone
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答案解析：