Hello!
The correct answer is C) It led to social upheaval and helped end the social order of the manor system.
The Black Death caused the ruin of many landowners since a lot of peasants had died because of the plague and there was no land under cultivation, so they had to substitute wages in place of labour services in order to keep their tenants. This favoured the peasants who survived because there was a higher demand.
Hope this helps.
