Why Were White People Called 'Caucasians' in Blumenbach's Racial Typology

Why were White people called 'Caucasians' in Blumenbach's racial typology?

A) Blumenbach thought that light-skinned people from the Caucasus Mountains (in Georgia/Eurasia) looked the most like Adam and Eve would had looked.
B) Caucasia is the opposite of melanin; accordingly, it leads to whiter skin.
C) Caucasus is one of the four elements that matched up with the four cardinal directions (north, south, east, west) and therefore with the four races.
D) Blumenbach himself was from a village in the Caucasus region.
E) Blumenbach's patron (sponsor) was from Mount Caucasus.