Which of the Following Is an Example of a Transboundary

Multiple Choice

Which of the following is an example of a transboundary problem?

A) pollution in Mexico's Tijuana River closing beaches in San Diego where the river empties into the sea
B) acid rain falling in Canada because of industrial emissions from the United States
C) currents concentrating garbage in areas of the Atlantic Ocean
D) All of these answer choices are examples of a transboundary problem.
E) None of these answer choices are examples of a transboundary problem.