The largest holes in the ozone layer have been observed in 2020 over which of the following continents?

Correct option is B

•  The largest holes in the ozone layer have historically been observed over Antarctica. The ozone depletion in this region is most prominent during the Southern Hemisphere's spring (September to November), due to a combination of chemicals like chlorofluorocarbons (CFCs) and cold temperatures in the stratosphere.
•  In 2020, scientists reported that the ozone hole over Antarctica was particularly large, but it started to show signs of recovery due to international efforts to phase out ozone-depleting substances through agreements like the Montreal Protocol.

• The ozone hole over Antarctica does not occur in other regions like Europe, North America, or Asia, although ozone depletion is a global concern.