According to A Journal of the Plague Year, there was violent behavior during the time of the plague in London. Which two statements provide explanations for such behavior? please help me

a) Plague victims sometimes had mental issues.
b) The authorities were too busy to prevent violence.
c) The grief felt by people led to mass riots.
d) Plague victims acted out against those who had infected them.
e) The suffering caused by the plague was literally unbearable.