The correct answer is C – Raynaud's syndrome. Answer A can be ruled out because of the absence of a cervical rib, negative Adson test, and costoclavicular maneuver. Answer C can be eliminated due to the distribution and type of symptoms. Answer D is interesting because, although uncommon, it produces similar symptoms AS Raynaud's. However, the disease, also called Buerger's disease, is more common in men and people of Middle Eastern or Asian descent, most of whom are heavy smokers or have a smoking history.