The COVID-19 pandemic of 2020 forced large-scale lockdowns that lasted for months in many countries. One interesting effect of these lockdowns was its effects on local air pollution. Which of the following statements is the best hypothesis about the effects of the pandemic on air quality?
a. Since people stayed home, there were far less industrial and transportation emissions.
b. Since people stayed home, air pollution declined in all parts of the world.
c. Since people Syed home, there were more family gatherings, resulting in more indoor air pollution.
d. Since people stayed home, families took more road trips, increasing the carbon dioxide emissions