Which statement is true about the Malthusian theory?

A) It predicts that famine can easily be averted.
B) It is an application of the law of diminishing returns.
C) It is unduly optimistiC.
D) It has proven true in most countries.

The Malthusian theory is an application of the law of diminishing returns, which states that as the population grows, the marginal product of labor will eventually decline, leading to a decrease in overall output. This theory also predicts that the population will eventually outgrow its resources, leading to famine and other forms of hardship. Therefore, option A and C are both incorrect. Option D is also incorrect as the Malthusian theory has not proven true in most countries, as many countries have been able to increase their food production and per capita income despite population growth.