What were economic effects of the plague

The plague had an important effect on the relationship between the lords who owned much of the land in Europe and the peasants who worked for the lords. As people died, it became harder and harder to find people to plow fields, harvest crops, and produce other goods and services. Peasants began to demand higher wages.

500 books can be produced by one man and a printing press within 5 months, while a copyist can only produce one in the same amount of time

letter d is correct.