What is the highlight in this sentence: "Zoologist Paul Ehrlich's(1968) extremely popular neo-Malthusian book, The Population Bomb, forced the issue of overpopulation into public consciousness in an apocalyptic way, claiming that 'the battle to feed all humanity is over. ' Biologist Barry Commoner (1971), the most political and intellectually sophisticated 'framer' of environmental concerns, disagreed with Ehrlich by arguing that the greatest threat to the environment was not population growth per se, but modern technology and the power of corporations that promote overconsumption. "
a) Neo-Malthusian concept
b) The Population Bomb
c) Overpopulation
d) Modern technology and corporations