A) A location that has a minor Aspect replaces 1 of the Mana regained with Mana of that type; sleeping in a graveyard might give you 1 Death Mana, while sleeping in a forest that just burned down might give you 1 Fire Mana.
B) A location that has a major Aspect replaces all of the blank Mana with Mana of that type; sleeping in the Underworld would give you a mess of Death Mana.
C) A location can only have on major Aspect, but can have multiple minor Aspects, or a mix of one major Aspect and multiple minor Aspects.