请教白勇语法test 4-1

1. 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
answer C

有点疑问是 one of +名词复数应该跟的是单数谓语动词吧？为什么选的是C，用的是复数谓语动词呢？还是因为that 修饰的是Great lakes ，所以用复数谓语动词。