Final answer:
The three support reactions not limited to a perpendicular force are shear, moment, and axial forces.
Step-by-step explanation:
The student's question pertains to types of support reactions in structural engineering or mechanics. The correct answer to the student question: "The three support reactions which are not just a perpendicular force" is b) Shear, moment, axial. These types of forces are critical in understanding how structures sustain various loads. Axial force refers to a force applied along the length of an element, causing tension or compression. Shear force is applied perpendicular to the length and parallel to the cross-sectional area, leading to deformation. A moment is a force that causes rotation or bending around an axis.