thanghnvn Wrote:Thank you Ron, Manhantan experts,

I never choose C but choose A. But why C is wrong?, pls, help.

To me C seems to be saying that one goal of the research is the development. Which isn't true - one goal of the research is to develop...

Is this wrong?

I have a doubt here.I had read in SC guide that when 'and' is preceded by a comma the following sentence must have a subject of its own but here in (C) we are not having any subject (they) after 'and'. C. "that local witnesses are difficult to locate, reticent, and" This is a different si...