Through which of the following continents does the Prime Meridian pass?
Africa
Africa is correct.
The Prime Meridian is the 0° longitude line passing through Greenwich, London. From the North Pole it crosses Europe (the United Kingdom, France and Spain), then Africa (Algeria, Mali, Burkina Faso, Togo and Ghana), and finally Antarctica.
It lies far west of Asia and Australia and far east of North America, so none of those continents is crossed.