Why Is the Elbow Joint Considered to Be Extremely Stable

Why is the elbow joint considered to be extremely stable?

A) Its relatively loose joint capsule permits an extensive range of motion.
B) It has especially large and numerous bursae.
C) Powerful muscles originating on the trunk, shoulder girdle, and humerus cover the joint capsule.
D) The bony surfaces of the humerus and ulna interlock.
E) A rotator cuff is associated with the joint.