Which line of dialogue from the red badge of courage best develops henry's character

The paragraph that best develops Henry's character is when the narrator locate them on the way to Washington, describing him as:

He had grown to regard himself merely as a part of a vast blue

demonstration. His province was to look out, as far as he could, for his

personal comfort. For recreation he could twiddle his thumbs and

speculate on the thoughts which must agitate the minds of the generals.

Also, he was drilled and drilled and reviewed, and drilled and drilled and

reviewed.

i'm thinking it would be when compound subjects are joined by or, nor,either-or, neither-nor.

it would be d because the however is more proper and the comma is placed in the right spot