Do you guys get this? If so give ur guys opinions bc I don’t get this! I asked my mom and my dad and they literally don’t get it either. I just need help on; Factor 2, Factor 3, and Factor 4

My questions to you guys how will you vote nay or yea?

Which action by the us war department angered chief red cloud to the point that he refused to sign the treaty of fort laramie ? a) the killing of buffalo by the united states troops b) the appointment of troops to the powder river basin c) the burning of parts of the powder river basin d) the murder of chief red cloud’s wife