Area and volume SAT question

Choice B is correct. The area of a rectangle with length $l$ and width $w$ can be found using the formula $A=lw$. It’s given that the rectangle has a length of $4\text{cm}$ and a width of $2\text{cm}$. Therefore, the area of this rectangle is $(4\text{cm})(2\text{cm})$, or $8{\text{cm}}^2$.

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

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

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