The actions of the lumbricals are:
A. Extension of the fingers at the MP joints, and flexion of the fingers at the PIP and DIP joints
B. Extension of the wrist at the CM joints, and flexion of the fingers at the MP joints
C. Flexion of the fingers at the MP joints, and extension of the fingers at the DIP and PIP joints
D. Flexion of the fingers at the MP joints, and flexion of the fingers at the DIP and PIP joints