Refer to the Following Excerpt to Answer the Question

Refer to the following excerpt to answer the question. Nothing could be more misleading to our children than our present affluent society.They will inherit a totally different world,a world in which the standards,politics,and economics of the 1960s are dead.As the most powerful nation in the world today,and its largest consumer,the United States cannot stand isolated.We are today involved in the events leading to famine;tomorrow we may be destroyed by its consequences.
Our position requires that we take immediate action at home and promote effective action world-wide.We must have population control at home,hopefully through a system of incentives and penalties,but by compulsion if voluntary methods fail.We must use our political power to push other countries into programs which combine agricultural development and population control.And while this is being done we must take action to reverse the deterioration of our environment before population pressure permanently ruins our planet.
Paul Ehrlich,The Population Bomb,1969
The controversy highlighted in the excerpt above led most directly to

A) conservation measures by activists and legislators.
B) urban unrest and challenges to the traditional family.
C) concerns about how social changes were affecting American values.
D) the rise of the Sunbelt as a political and economic force.