The correct answer is Transverse.

Explanation: The human body can be divided into different planes for anatomical study and description. The anatomical planes are imaginary flat surfaces that pass through the body.

- The sagittal plane divides the body into left and right parts.
- The frontal plane (also called the coronal plane) divides the body into front (anterior) and back (posterior) parts.
- The transverse plane (or horizontal plane) divides the body into upper (superior) and lower (inferior) segments.
- The oblique plane is any plane that passes through the body at an angle other than 90 degrees to the other planes.

Thus, the transverse plane is the answer because it specifically separates the body into superior and inferior sections, effectively creating upper and lower parts.

Reference: Gray's Anatomy, 41st Edition, Volume 1, Chapter 2: The Anatomical Planes and Sections