Read the excerpt from Heart of a Samurai. Manjiro tried to put his heart in order. He said a sutra – a prayer – for his ancestors, his family, his friends, and for himself. Then he waited for his heart to go back where it belonged instead of jumping all over inside his chest
The last three answer choices are all very similar in meaning, and pertain to him the least. So I think that the answer would be that he is determined mire than anything,