Final Answer:
The sentence that suggests Sara's reluctance to give the last few buns to the street child is: "Her short, black locks tumbled about her ears, and she looked more like a gypsy than ever, as she said, 'I can't give you any more, but I wish I could.'"
Step-by-step explanation:
In the provided excerpt from Frances Hodgson Burnett's "Sara Crewe: or What Happened at Miss Minchin's," the key sentence indicating Sara's reluctance to give the last few buns to the street child is "I can't give you any more, but I wish I could." This statement implies a desire to help but an inability to provide further assistance. The use of the word "can't" conveys a sense of limitation or constraint, suggesting that Sara may be facing some form of restriction or scarcity.
The sentence captures a poignant moment, revealing Sara's compassion for the less fortunate and the challenges she herself may be navigating within the story. Overall, it contributes to the character development and establishes a sense of empathy and altruism in Sara Crewe.