Given the question: Dialogue: M: I can't bare the air pollution in this city anymore. It is getting worse and worse. W: You said it. We've never had so many factories before. Question: What does the man mean? - The air pollution is caused by the development of industry. - The city was poor because there wasn't much industry then. - The woman's exaggerating the seriousness of the pollution.
The answer is:
The air pollution is caused by the development of industry.