Thomas Malthus Felt the Human Population Was in Danger of Outrunning

Thomas Malthus felt the human population was in danger of outrunning its food supply because

A) he thought population would increase at a geometric rate while land remained essentially fixed in supply.
B) environmental pollution would eventually decrease the efficiency of agriculture.
C) the expected standard of living grows over time.
D) profits were insufficient to induce farmers to use their land properly.
E) the production possibilities curve shifts inward as population increases.