The correct answer is d) Mount Ras Dashen and Kobar Sink. Mount Ras Dashen is the highest peak in the Horn of Africa, located in the Simien Mountains of Ethiopia, with an elevation of 4,550 meters (14,928 feet). Kobar Sink, on the other hand, is the lowest point in the Horn of Africa, located in the Danakil Depression of Ethiopia, with an elevation of approximately 125 meters (410 feet) below sea level.