What is the general tone of this passage

A．their excessive consumption has caused world resource exhaustion
B．they are confronted with the problem of how to obtain more material goods
C．their unfair shale of the world's resources should give way to proper division among countries
D．they have to discard their cars for lack of fossil fuel in the world

A．people in poor countries scarcely know how to enjoy a high standard of living
B．the world's resources being' limited, the people in underdeveloped countries are bound to live a poor life
C．most Americans know that the world's resources of many kinds are becoming scarce
D．it is impossible for all the people in the world to improve their living standard