Use the image to answer the following question: The image shows a table with Cause in the left column and Effect in the right column. The sentence Millions of deaths from the Black Death caused a shortage of workers in Medieval Europe is underneath Cause. There is nothing under Effect.

Which of the following fits best in the effect side?

a
Crops were destroyed and there was a food shortage.

b
Laborers were in high demand and expected more pay.

c
Many people died during the Hundred Years' War.

d
Wheat prices increased by almost three times their worth.