Answer:
The correct answer is B. Mexico City.
Step-by-step explanation:
Recently, Mexico city's officials declared that air pollution in this city had reached levels that could be harmful to people's health. In this way, they recommended people to stay at home and try not to use their cars.
Since 1992, some improvements were made in Mexico City to control the air pollution when this city was considered "the most polluted city on the planet." by the United Nations.
Since 2016, pollution in Mexico City has reached levels considered as harmful to people's health and the main problem is that the city's population keeps growing and for this reason, there are more cars in this city every year. Another problem which emerged because of the pollution was school absenteeism, especially in children.