Raynaud's phenomenon has associated progressive tricolor changes of the skin from ___ to ___ then to ___.
State the mechanism for each of these color changes.
a) White to red to blue; vasoconstriction, rebound hyperemia, tissue ischemia
b) Blue to red to white; vasodilation, decreased blood flow, tissue necrosis
c) Red to white to blue; vasospasm, vascular injury, tissue regeneration
d) Blue to white to red; tissue hypoxia, blood stasis, tissue inflammation