Historical i know i had this question
Mr. Grave wanted the other members of the donner party to eat the flesh of his body once he died, so they could live. They were put into horrible conditions and their supplies were already run out weeks ago. To the group of pioneers it seemed that there was nothing to do for living but kannibalism, so they ate fleshes of the dead. Therefore, Mr. Grave was ready to make such a sacrifice, hoping that he can save lives.
The answer to your question is A and C, otherwise known as:
It expresses pride and longing for his country.
The laughter functions as a metaphor for patriotism.
He imagines he is back at home on a typical morning. He is a dreamer and wants to escape his current situation by imagining his way out
