Which research source would provide the most bias-free information to support the building of the strip mall?

- A study of local economics by an objective research company.

Explanation:

The research source that would propose the most bias-free data or information to back the building of the strip mall would include a study of local economics provided by an objective research company. Such agencies or companies conduct qualitative researches that offer valid and credible information(without any prejudice) which is crucial to establish your central idea or thought. Thus, data or information obtained from such a company would not only back the central idea of building a strip mall but also offer a logical(through statistics) dimension that would convince the audience. Thus, 'a study of local economics by an objective research company' would propose reliable information to substantiate the idea.