The correct answer is C. Screeding.
Screeding is the process of leveling a concrete floor by dragging a screed across the surface. The screed is a long, flat tool that is used to smooth out the concrete and remove any air bubbles. Screeding is an important part of the concrete finishing process, as it ensures that the floor is flat and smooth.
Topping is a layer of material that is applied to the surface of a concrete floor. Topping can be used to protect the floor from wear and tear, to improve its appearance, or to provide a slip-resistant surface. There are many different types of topping, including epoxy, urethane, and cementitious toppings.
Bedding is a layer of material that is placed under a concrete slab. Bedding helps to distribute the weight of the slab and prevents it from settling unevenly. Bedding can be made of sand, gravel, or crushed stone.
None of these is the correct answer.