To find the area of a rectangle, which formula should be used?

The area of a rectangle is determined by multiplying its base (or length) by its height (or width). This straightforward calculation captures the total two-dimensional space that the rectangle occupies. The formula is summed up as Base x Height.

Using either base or height alone, or attempting to manipulate these dimensions through addition or subtraction, does not yield the correct area measurement. The base and height must be multiplied together to account for both dimensions of the shape. This is why C is the correct choice; it accurately represents the formula used in geometry to calculate the area of a rectangle.