请教一道语法题?

leoxie1028

With its plan to develop seven and a half acres of shore land，Cleveland is but one of a large number of communities on the Great Lakes that is looking to its waterfront as a way to improve the quality of urban life and attract new businesses.
(A) is looking to its waterfront as a way to improve the quality of urban life and attract
(B) is looking at its waterfront to improve the quality of urban life and attract
(C) are looking to their waterfronts to improve the quality of urban life and attract
(D) are looking to its waterfront as a way of improving the quality of urban life and attracting
(E) are looking at their waterfronts as a way they can improve the quality of urban life and attract

that从句该修饰哪一个呢? cleveland or communities?谢谢!

另外,cost of sth 可否根据sth而用复数,lzm讲cost of 只用单数,感觉好像不对

Kilroy

zyh79 is a helpful guy

范进

都让zyh79讲完了。精彩！

zyh79

规则： one of n(pl.).that v(pl.)
  but(only) one of n(pl.).that v(pl.)
  the only one of n(pl.).that v(单)
  that修饰communities