Which continent is known as the 'Dark Continent'?

The term 'Dark Continent' historically refers to Africa. This designation originated during the late 19th century when many areas of Africa were largely unexplored by Europeans, and the continent was seen as mysterious due to the lack of knowledge about its geography, culture, and peoples. The "dark" aspect specifically referred to the unfamiliarity and the uncharted territories that surrounded it, rather than any implication of actual darkness or negativity.

Additionally, the term has been associated with the portrayal of Africa in literature and colonial narratives, which often emphasized the continent's perceived mysteries and dangers. While this term has fallen out of favor and is considered outdated and problematic due to its colonial connotations, it has left a lasting mark in the history of how continents were viewed during the age of exploration.

The other continents listed in the choices do not share this particular historical label. Asia, Australia, and South America have been known and mapped to a greater extent in comparison during the same historical periods, which is why they are not referred to in this way.