Which of the following is screwed directly to wall studs and creates the partitioning between rooms?

The correct answer is plasterboard. Plasterboard, often referred to as drywall, is a building material used to create interior walls and ceilings. It consists of a gypsum core sandwiched between two sheets of paper or other materials. When constructing a partition wall, plasterboard is attached directly to the wall studs, providing a framework that separates different rooms or spaces within a building.

While options like plywood, wood paneling, and drywall itself are also used in construction, they serve different purposes or are applied differently. For example, plywood is typically used for sheathing or subflooring, rather than as a primary wall material. Wood paneling is often decorative and may be installed over other types of walls rather than serving as the structural element itself. Drywall is a common term for gypsum board or plasterboard, but the specific term "plasterboard" highlights its composition and intended use in creating smooth, finished interior walls.