Final answer:
The assessment finding that warrants immediate intervention by the nurse is right foot pale with sluggish capillary refill.
Step-by-step explanation:
The assessment finding that warrants immediate intervention by the nurse is option b, right foot pale with sluggish capillary refill. This is a sign of compromised blood flow to the foot, which can indicate a serious problem such as arterial occlusion or embolism. Immediate intervention is necessary to prevent further complications and ensure proper blood supply to the foot.