In the Köppen Classification System, Highland Climates Are Undifferentiated, Signifying

In the Köppen classification system, highland climates are undifferentiated, signifying that ____. ​

A) highland climates do not differ from other climate regions
B) highland climates do not really constitute a definable climate
C) highland climates vary too greatly with latitude
D) much variation in microclimates occurs in relatively small areas
E) there is very little variation within highland climates