The sentence from the passage that contains an oxymoron is:
C. "There's so much more to see than this gem place that we have to be."
An oxymoron is a figure of speech that juxtaposes contradictory terms. The phrase "gem place" could be interpreted as a place that is highly valued or beautiful, and referring to it dismissively implies a contradiction in evaluating its worth compared to what else there is to see. However, none of the options provided contain a strict oxymoron. In this context, option C comes closest to the idea of contrasting perspectives.