Step-by-step explanation:
If reverse and transform faulting are not among the options, then the two events that result from shear acting on Earth's crust are:
C. Horizontal forces
D. Vertical forces
Shear forces occur when two tectonic plates move past each other in opposite directions. This type of movement can result in horizontal forces that cause rocks to slide past each other, as well as vertical forces that can cause one part of the crust to move up or down relative to another part. These forces can lead to the formation of features such as faults, folds, and mountains.