With a new park, stadium, and entertainment complex along the Delaware River, Trenton, New Jersey, is but one of a large number of communities that is looking to use its waterfront as a way for it to improve the quality of urban life and attract new businesses.

A. is looking to use its waterfront as a way for it to improve the quality of urban life and attract
B. is looking at using its waterfront to improve the quality of urban life and attract
C. are looking to use their waterfronts to improve the quality of urban life and attract
D. are looking to use its waterfront as a way of improving the quality of urban life and attracting
E. are looking at using their waterfronts as a way of improving the quality of urban life and attract

In the correct answer, “that” modifies “communities” rather than “one (a new park, stadium, and entertainment complex).” Why?

However, in the following question, “that” in the correct answer modifies “aspects” rather than “ocean environment,” how come? Both of the structure are similar – “one of a large number of communities that……” and “one of the many aspects of the ocean environment that……” Does the usage of “that” depend on the contexts in the different sentences?

The global-warming effect of ocean white caps are one of the many aspects of the ocean environment that are not yet incorporated in any detail into computer models used for predicting how rising greenhouse gas concentrations could affect climate.

A. The global-warming effect of ocean white caps are one of the many aspects of the ocean environment that are not yet incorporated in any detail into computer models used for predicting
B. The effect on global warming of ocean white caps are one of the many aspects of the ocean environment not yet incorporated in any detail into computer models, which they use to predict
C. The effect of ocean white caps on global warming is one of the many aspects of the ocean environment that are not yet incorporated in any detail into the computer models used to predict
D. That ocean white caps have an effect on global warming is one of the many aspects of the ocean environment not yet having been incorporated in any detail into the computer models that are used for predicting.
E. That ocean white caps have an effect on global warming is one of the many aspects of the ocean environment not yet being incorporated in any detail into computer models, which they use to predict.

Can any of the experts replies I think it is a Manhattan or gmat prep

this one confusses me to any experts please