Which of the Following Illustrates the Effects of Linkage on Environmental

Which of the following illustrates the effects of linkage on environmental problems?

A) Greenpeace monitored Japanese whaling vessels while providing information to governments about weather trends.
B) The United States and Canada are each other's largest trading partners,and together they stopped the problem of acid rain.
C) Mexico blames pollution from the United States for birth defects in Tijuana.
D) Southern European and northern African countries share responsibility for pollution levels in the Mediterranean Sea.
E) Australians have experienced rising skin cancer rates because of ozone depletion.