Context: He doubled up in her arms , then went limp . His body rolled over , his face wedging in the roots of a drift stump . Rin struggled to turn him over again ; small pebbles stuck to the bared front of his body . One hand still clamped over the broad smear of blood .
Question Why was the hand still clamped over the broad smear of blood ?
Possible answers:

[I] The water was cold on the wound and it hurt .;
[II] he was embarrased because he was bleeding .;
[III] It was painful .;
[IV] None of the above choices .;
The answer:
[III]