Final answer:
The correct term for knees bending inward is Valgus Collapse, and for a muscle that moves the leg away from the body, the term is abductor.
Step-by-step explanation:
The term used when knees bend inward is A. Valgus Collapse. This is a condition where the knee angle moves inward as the individual is squatting or during other lower body exercises. It is often considered a form of malalignment and can sometimes lead to knee issues if not corrected. In contrast, the adaptation of the femur bones angling inward to make bipedal locomotion more efficient is known as the valgus angle, as referenced by Rice University, OpenStax under CC BY 4.0 license.
The correct term for a muscle that moves the leg away from the body is an abductor muscle. Muscles named with this term are responsible for the movement known as abduction, which is the motion of pulling the leg away from the midline of the body.