What Best Describes the Problem of Sustainable Development

What best describes the problem of sustainable development?

A) While poor people consume less than their wealthier counterparts, they are also more constrained from pursing environmental goals.
B) Poor people consume as much as their wealthier counterparts, but do so more cheaply and with less regard for the environment.
C) Wealthy people consume less than their poorer counterparts because they have the luxury of taking environmental goals into account.
D) Wealth and consumption are not correlated.