The statement that best describes an informal argument for the formula for the volume of a cylinder is:
A cylinder is a stack of h circles, each with an area of πr² and a thickness of one unit, so its volume formula is V=πr²h.
This accurately describes how the volume of a cylinder can be thought of as the area of the base (which is the circle with area πr²) multiplied by the height (h) of the cylinder.