There are several types of inclined planes. A is made by placing two inclined planes back to back. A is made by wrapping an inclined plane around a cylinder.
A.
wedge, lever
B.
lever, screw
C.
wedge, screw
D.
screw, wedge

A Wedge is made by placing two inclined planes back to back.

A Screw is made by wrapping an inclined plane around a cylinder.

Explanation:

A wedge is an uncomplicated machine that consists of two sloping planes, providing it a thin end and thick end. A wedge is used to separate or split apart objects. Force is employed to the thick end of the wedge, and in turn, applies force to the object along both of its sloping sides.A screw is a simplistic machine that consists of an inclined plane wrapped around a cylinder or cone. The absolute mechanical benefit of wedges and screws is invariably higher than 1.

Black round and partialy brown with little hairs that stick out, or a little creature that digs in the dirt that has wird pink whiskers in the front of its nose thats partily blind

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.