Read the following passage and answer the questions below and answer the questions.
Everyone wants to reduce pollution. But the pollution problem is as complicated as it is serious. It is complicated because much pollution is caused by things that benefit people. For example, exhaust from automobile provides transportation to millions of people. Factories discharge much of the material that pollutes the air and water, but factories give employment to a large number of people. 3. Pollution is brought about by things that benefit people.
Question: Why is the pollution problem complicated?
Đáp án: Because much pollution is caused by things benefit people.