Concept:Africa’s central meridian lies near 20∘E, which divides the continent into roughly equal eastern and western halves.Explanation:Africa extends from about 17∘W in the west to about 51∘E in the east.The midpoint between these longitudes is approximately 17∘E.Among the given options, 20∘E is the closest to this midpoint.Therefore, longitude 20∘E almost bisects Africa into two equal halves.Answer:A. 20∘E