SAT Question 3f236a64: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice D is correct. Since the ratio of $y$ to $x$ is constant for each ordered pair in the table, the first row can be used to determine that the ratio of $y$ to $x$ is $4$ to $1$. The proportion $\frac{4}{1}=\frac{k}{40}$ can be used to solve for $k$. Multiplying each side of the equation by $40$ yields $160=k$.