Correct option is C
Explanation-
During the Covid-19 pandemic in 2020, most countries experienced a significant drop in CO₂ emissions due to lockdowns, reduced industrial activity, and limited transportation. However, China showed the smallest fall in CO₂emissions in percentage terms.
According to data from global carbon reports:
China's emissions dropped only slightly (~1.4%) in 2020 because China was the first to enter lockdown but also first to reopen, especially its industries. Its heavy dependence on coal and manufacturing meant that emissions resumed quickly.
Comparatively India and the European Union saw much larger declines (India ~9-11%, EU ~10%), USA also had a substantial fall (~12%).
Correct Option: c- China


