The correct answer is: Option C. Limiting activities along Silver Lake will reduce pollution in the lake and along its shore.
An argumentative research paper picks a topic to be analyzed within the content, but the author is compelled to include information on the matter as evidence to support their claims.
Regarding Option C, the author is adamant and confident on the outcome of their claim, which can be noted with their use of the auxiliary verb "will" - meaning that said proposal will have an impact on somebody's interests. The reader is able to argue on this claim.