(A) Optimum Population Theory is significantly associated with Edwin Cannan. (B) Social Mal-adjustment Theory is associated with Henry George, who linked poverty and social issues to land ownership and advocated a single tax on land value. (C) Demographic Transition Theory was initially proposed by Warren Thompson and later developed by Frank Notestein. (D) The Population-Food Supply Relationship Theory is the core of Thomas Robert Malthus's famous Essay on the Principle of Population.