What can be inferred about the future of some business in big cities if the issue worsens?
A.They will be no longer exist due to alarming levels of AQI.
B.Their staff will surely ask to be able to work from home.
C.They may be located in some cleaner cities such as Da Nang or Nha Trang.
D.Their leaders will shift the company's business to a less polluting business.

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