The longitude which almost bisects Africa into two equal halves, east and west, is longitude-----------

Analyze the question: We need the meridian that splits Africa into roughly equal eastern and western halves.

Concept: Africa's extent in longitude runs from about 17°33'W (Dakar, Senegal, the westernmost point at Cape Verde/Pointe des Almadies) to about 51°E (Ras Hafun, Somalia, the easternmost point).

Solution:

• Westernmost point ≈ 17.5°W
• Easternmost point ≈ 51°E
• Total span ≈ 17.5 + 51 = 68.5°
• Half of the span ≈ 34.25°, measured from the west end: 34.25 − 17.5 ≈ 16.75°E

So the midpoint is about 17°E to 20°E. The nearest option is 20°E.

Check the other options:

• 20°W lies in the Atlantic Ocean, west of Africa, so it cannot bisect the continent.
• 40°W is far out in the Atlantic.
• 40°E passes through the eastern part of Africa (Ethiopia, Kenya, Somalia area), so it leaves most of the continent to its west.

Also, the Prime Meridian (0°) passes through West Africa (Ghana, for example), but it does not split Africa evenly, since much more land lies to the east. The bisecting line is further east, around 20°E, which passes through Libya, Chad, the Central African Republic, the DRC and Angola area, and South Africa's region.

Answer: A. 20°E.

Tip: Remember that Africa is "mostly east" of the Prime Meridian. If a question asks for the line that bisects Africa, pick the nearby east longitude (20°E), not a west one and not one as far east as 40°E.