SAT Question 4420e500: Area and Volume answer and explanation with Desmos solution

Choice A is incorrect. This is the sum, $\text{in cm}$, of the length and width of the rectangle, not the area, ${\text{in cm}}^2$.

Choice C is incorrect. This is the perimeter, $\text{in cm}$, of the rectangle, not the area, ${\text{in cm}}^2$.

Choice D is incorrect. This is the sum of the length and width of the rectangle squared, not the area.