What differentiates extension from hyperextension? A. Extension bends joints in the opposite direction as hyperextension. B. Extension straightens a joint, and hyperextension bends it but in the opposite direction from flexion. C. Hyperextension straightens a joint, and extension bends it in the opposite direction from flexion. D. Both bend joints, but extension can be damaging.

B is the closest answer if I'm understanding it correctly.

Extension straightens a joint but hyperextension bends a joint past it's normal range which can cause an injury.

B) Extension straightens a joint, and hyperextension bends it but in the opposite direction from flexion.

the answer is design

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.