The flagellants began a movement in 1348 that attempted to pay penance for the sins

The flagellants began a movement in 1348 that attempted to pay penance for the sins of towns and therefore prevent the plague from traveling there. how was this practice typical of human understanding during the middle ages?
a.humans believed that the plague could be cured by blood-letting, so they used flagellation to make themselves bleed.

b.humans were superstitious of things they didn't understand and tended to blame sin for everything bad that happened.

c.humans looked to the pope for direction in how to prevent the plague, and the pope told them to whip themselves.

d.humans understood how disease worked even during the middle ages.