SAT Question 69f6717f: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice A is correct. It's given that the sample is in the shape of a cube with edge lengths of $0.9$ meters. Therefore, the volume of the sample is $0.90^3$, or $0.729$, cubic meters. It's also given that the sample has a density of $807$ kilograms per $1$ cubic meter. Therefore, the mass of this sample is $0.729\text{cubic meters}\left(\frac{807\text{kilograms}}{1\text{cubic meter}}\right)$, or $588.303$ kilograms. Rounding this mass to the nearest whole number gives $588$ kilograms. Therefore, to the nearest whole number, the mass, in kilograms, of this sample is $588$.