SAT Question 15617f62: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice C is correct. It's given that the population density of Worthington is $290$ people per square mile and Worthington has a population of $92,800$ people. Therefore, the area of Worthington is $92,800\text{people}\left(\frac{1\text{square mile}}{290\text{people}}\right)$, which is equivalent to $\frac{92,800\text{square miles}}{290}$, or $320$ square miles.