Which would be the best title for the map? “Africa's Unique Desert Regions"

“Africa's Diverse climatic Zones"

“Africa—The Origin of Humankind”

“Africa—A Mosaic of Cultures”

"Africa's Diverse climatic zones."

Explanation:

The reason is because it is showing a climate map, meaning the "Origin of Humankind" and "A mosaic of Cultures" are already incorrect. Once you look at the map you'll see that its mostly not desert, but a mix of many climates from Mediterrean  /Drylands climate in the north to the Mountains of Ethiopia.  So it cancels out "Africa's unique desert regions" Leaving you with "Diverse climatic zones."

the answers is b.   environments.