Help on this history question thx

Why was mao zedong’s communist china ready to use military tactics against the troops of us general douglas macarthur in korea? a. mao zedong had long planned to declare war against the united states. b. us troops kept marching farther into north korea, getting closer to the chinese border. c. us president harry truman threatened to use nuclear weapons against china. d. kim il sung had requested china’s to declare war against the united states.

Numbing feelings with addictive substances becomes a vicious cycle as the addiction itself often manifests further negative emotions

Define the term brutalization effect and describe in your own words why you think this occurs and how it conflicts with the ideas of deterrence theory.