The report titled Action on Air Quality was released by the United Nations Environment Program (UNEP) on 24 May 2016. Which fact is true in this regard?

• A. According to the World Health Organization (WHO), the global urban pollution level has increased by 8 percent between 2008 and 2013.
• B. Less than 20 percent of countries have taken measures to prevent pollution from burning waste.
• C. Only a quarter of countries have taken measures to curb vehicular pollution so that pollution can be controlled. Electric cars have increased in various countries for pollution control.
• D. All of the above