Which detail or quote from the story helps show that Benjamin Franklin regretted disappointing his father?

A.
To the end of his life, Benjamin Franklin never forgot this conversation with
his father.

B.
The boy approached and stood in front of his father’s chair.

C.
“Father,” said Benjamin, hanging his head at fi rst, but then lift ing his eyes
to Mr. Franklin’s face, “if it had been just for me, I would never have taken
the stones.”

D.
“If the owner of the stones built a house with them, then nobody would be helped
except the owner of the house.”

He's hanging his head, most likely and commonly seen as a sign of shame. He then proceeds to say (as I assume) that whatever the action was that he did, he did for someone, to help or protect them.

A. Is the second most reasonable answer in my opinion, as the fact that whatever the conversation was stuck with him for so long is a probable sign that there was some form of lingering regret or shame attached to it.