Which of the following movements in mammalian skeleton represent the leverage of the third order ltbgt (force applied at a point between fulcrum and the point of resistance) ?
A. Biceps muscle flexing arm at elbow
B. Triceps muscle extending arm at elbow.
C. Gastrocnemius muscle raising weight of body on toes
D. Movement of the head of femur in the acetabulum o pelvic girdle
