What Was the Thesis of Paul Ehrlich's 1968 Book the Population

What was the thesis of Paul Ehrlich's 1968 book The Population Bomb?

A) That the poverty of the Third World would result in savage racial wars.
B) That a green revolution could solve the world's overpopulation problem.
C) That conflict between liberalism and communism would destroy the world.
D) That it was too late to prevent hundreds of millions of people from starving.