Which one of the following is the continent with the highest mean elevation in the world ?

Antarctica is the continent with the highest mean elevation on Earth. Multiple geographic references report Antarctica’s average surface elevation as roughly 2,200–2,500 metres (about 7,200–8,200 feet), making it the highest continent by mean elevation [2]. The exceptionally high mean elevation is primarily due to the vast, thick ice sheet that covers the continent; the ice surface and polar plateau raise the continent’s overall surface altitude well above other continents (South Pole elevation and interior icecap peaks are cited as examples) [2]. For these reasons, Antarctica is identified as the highest continent in mean elevation comparisons.

Sources

1. [1] https://www.britannica.com/place/Antarctica
2. [2] https://polardiscovery.whoi.edu/antarctica/geography.html