If it is summer in Australia, which of the following months could it be?

Australia is located in the Southern Hemisphere, where the seasons are reversed compared to those in the Northern Hemisphere. In Australia, summer officially runs from December to February. Therefore, January falls within this period and is indeed considered a summer month.

When considering the other months, April is in autumn, August is still winter, and October is in spring in Australia. These months do not align with the summer season, which is why January is the only month listed that corresponds to summer in Australia.