Final answer:
When Graff tells the other Launchies that Ender is the best in their launch, the other boys congratulate Ender. Option A
Step-by-step explanation:
When Graff tells the other Launchies that Ender is the best in their launch, the other boys congratulate Ender because they recognize his exceptional abilities. Ender's talent and skill impress the others, leading them to admire and respect him. Congratulating Ender is their way of acknowledging his achievement and showing their support.
This scenario can be seen in the novel 'Ender's Game' by Orson Scott Card, which is a science fiction novel set in a future where children are trained as soldiers to defend humanity against an alien threat. The story explores themes of leadership, intelligence, and the psychological effects of warfare. Option A