After Falling Down a Flight of Stairs, It Feels Like

After falling down a flight of stairs, it feels like you broke your ankle; however the emergency room doctor says you tore a ligament. This means you tore the

A) insertion of a muscle.
B) the cartilage in your ankle joint.
C) connective tissue band that joins two bones.
D) delicate membrane that covers the surface of the bone.
E) connective tissue band that attaches muscle to bone.