Answer :
Answer:
A) The execution of John Brown led northerners to view him as a martyr while southerners began to militarize for future raids
Explanation:
All of the other ones were causes of the war. (slavery, free states, etc)
im not 100% sure but i think its (1) The execution of John Brown led northerners to view him as a martyr while southerners began to militarize for future raids.