Answer:
C, He led his people in war and in peace, and he was loved by Americans
Step-by-step explanation:
I suggest process of elimination to help you get the answers on your own- it says "First in peace" so the first answer doesn't make sense. it also says "First in the hearts of his countrymen" meaning he was loved by his people, making the second choice invalid. That only leaves C, which makes the most sense anyways.