Answer:
c) the author cites resources from respected authorities.
Step-by-step explanation:
a) the author is urging action that would financially benefit that author. No. The author will tend to favor the financial benefactor.
b) the author is biased toward one perspective. No. The author will tend to favor his/her bias toward one perspective.
c) the author cites resources from respected authorities. Yes. More than one person is agreeing to a position, reinforcing conclusions from other.
d) the author is affiliated with an organization that is committed to one side of the issue. No. The author will tend not to disagree with his/her employer.