Answer:
C. Darl is implying that Jewel would care more if his horse were dead, but it's their mother who is dead, which is causing the vultures to circle their farm.
Step-by-step explanation:
Darl's observation about the vultures is his way of reminding Jewel that their mother is dead and that they need to take care of her body. By saying that his horse is not dead, he is drawing a contrast between Jewel's concern for his horse and his lack of concern for their mother's death. Darl is implying that the vultures are circling the farm because of their mother's dead body, not because of Jewel's horse.