What plane divides the body into superior (upper) and inferior (lower) sections?

The transverse (horizontal) plane is the correct answer because it is specifically defined as the plane that divides the body into superior (upper) and inferior (lower) sections. This plane runs horizontally through the body, allowing for a separation of the upper parts from the lower parts along the horizontal axis.

Understanding the function of the transverse plane is crucial, especially in the field of athletic training and anatomy, as it helps professionals analyze movements, injuries, and rehabilitation from a perspective that considers how the body is organized in three-dimensional space. The other planes, such as the frontal and sagittal planes, divide the body differently; the frontal plane separates the body into anterior (front) and posterior (back) sections, while the sagittal plane divides it into left and right portions.