Which Is an Action of the Flexor Digitorum Profundus

Which is an action of the flexor digitorum profundus?

A) flexion of the forearm at the elbow joint
B) flexion of the arm at the glenohumeral joint
C) extension of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints
D) flexion of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints