Final answer:
The line of dialogue that best develops Henry's character in 'The Red Badge of Courage' reflects his inner struggle and the transformation from fear to a fierce desire to survive and fight.
Step-by-step explanation:
Among the lines of dialogue from The Red Badge of Courage that best develop Henry's character is the one where he reflects on his own nature and desire for life, indicating a transition from fear to a determination to survive and fight. This dialogue captures the essence of his internal struggle and transformation:
Able to speak, to know what was best, to raise these men and women working at his side up with him: sometimes he forgot this defined hope in the frantic anguish to escape, only to escape, out of the wet, the pain, the ashes, somewhere, anywhere, only for one moment of free air on a hill-side, to lie down and let his sick soul throb itself out in the sunshine. But to-night he panted for life. The savage strength of his nature was roused; his cry was fierce to God for justice.
This passage reveals Henry's emotional maturity and character development as he grapples with his experiences in the war and his own survival instincts. The use of dialogue, alongside the thematic elements of struggle and transformation, serves to develop Henry's character further and provide a window into his mind for the reader.