What Was the Famous Prediction Made by Thomas Malthus

What was the famous prediction made by Thomas Malthus?

A) The earth's population would reach 20 million by the year 2000.
B) The geometric growth of population would outstrip the earth's food supply.
C) The earth's population will resolve its environmental problems by relocating to another planet.
D) Rising sea levels will decimate the coastal populations of several nations.