Skeletal Muscles Are Arranged in Antagonistic Pairs

Skeletal muscles are arranged in antagonistic pairs. What does this mean and what is an example?

A) When one contracts, the other relaxes and this allows the bones to move; triceps and biceps.
B) When one sarcomere contracts, the neighboring one relaxes; triceps and biceps.
C) One is under conscious control and one is not; the diaphragm and ribs.
D) There is always paired cartilage and muscle tissue; the knee joint.
E) There are always paired tendons and ligaments; the hip joint.