"The depletion of water resources is a worrisome trend that impacts much of the world," insisted Dr. Sutton.
As far as I can tell, the only mistake is the end of the quote, where the comma should be within the quotation marks.
I believe that the answer is option B.
A person's beliefs and general outlook which act like filter on the information they receive are called perspective.
Perspective is the way you see things and whatever you believe in you would really stick unto it since your mind is already set for it. It's disregarding things other than your own thinking.