Leaders in the industrialized world see booming populations in the least industrialized nations as a threat to: a = the continued expansion of their own nations b = technology advancement c = the global balance of power d = the existing food supply

The right answer for the question that is being asked and shown above is that: "a = the continued expansion of their own nations." Leaders in the industrialized world see booming populations in the least industrialized nations as a threat to the continued expansion of their own nations