Correct Answer:
A. English Economist
Thomas Malthus was a highly influential figure in the fields of economics and demography. He is best known for his theory that population growth tends to outpace the growth of food supply, leading to poverty and famine, as articulated in his 1798 work, "An Essay on the Principle of Population." Hence, "English Economist" is the correct identification. He was not primarily an "English Physicist" (B), nor a "Political Leader" (C). While his work had philosophical implications, his core contributions were in economics and population studies, making "Philosopher" (D) less precise than his primary professional identity.