Multi-choice problem: Continue writing the next sentence in this paragraph:

How to make a fist
Extend all four fingers.
Hold your hand out straight and naturally extend all four fingers. Firmly press all four fingers together, leaving the thumb loose.

Options are:
[I] Your hand should stick straight out as though you are extending it for a handshake. Squeeze your fingers together with just enough pressure to turn them into a solid mass..
[II] Gently stretch both fingers, one in front of the other. The middle fingers (the injured fingers) should now be held like a fist..
[III] Hold them in this position for 20 seconds or longer. One to two seconds should be sufficient for dominant arm contact with the target..
[IV] Keep your hand at rest with one hand while your thumb rests comfortably behind it. Twist your palms with one hand up, and grip your fist with the other hand..
[I]