Which situation described below is an example of malthus' thesis? a) the recent ebola epidemic in africa. b) the irish potato famine of the 19th century. c) biotechnology provides food for a growing population. d) modern-day population human growth that is exponential.

The correct answer is D) Modern-day population human growth that is exponential.
Thomas Malthus in its Essay on the Principle of Population proposes the principle that human populations grow exponentially while food production grows at an arithmetic rate which will have the consequence that the number of people would increase faster than the food supply.  As a result, there will be resource limit that will lead to famine, disease, or war.