Answer:
C. Hyacinthus is so badly injured he might die.
Explanation:
This is the valid conclusion we arrive at after looking at the context of the sentence in "Apollo and Hyacinthus" by Thomas Bulfinch
"The god, as pale as himself, raised him and tried all his art to stanch the wound and retain the flitting life, but all in vain; the hurt was past the power of medicine."
Note, the expression "tried all his art to stanch the wound and....," the next expression gives the implication, to "...retain the flitting life." This thus shows that Hyacinthus is so badly injured he might die.