What is the general tone of this passage

A．The United States will be isolated if it does not stop pursuing super affluence.
B．The poor countries will no longer supply the United States with their goods.
C．The United States should care about the well-being of other countries.
D．It is time for the Americans to help the people in poor countries to improve their living standard.

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