The nurse is assessing an ulcer on a client's lower extremity, which is likely the result of either venous or arterial insufficiency. Which assessment technique should the nurse use to differentiate the pathophysiology causing the ulcer?

A. Skin turgor assesses skin elasticity and hydration, which is more indicative of general hydration status rather than specific types of insufficiency. While poor skin turgor might be observed in various conditions, it does not specifically differentiate between venous and arterial ulcers. B. The location and appearance of the ulcer can provide significant clues about its etiology. Venous ulcers often appear on the lower legs, particularly around the medial malleolus (inside of the ankle), and tend to have irregular, shallow, and often wet or weepy edges. C. Changes in color upon movement can provide insight into the type of insufficiency. For arterial ulcers, the leg may appear pale or blanched when elevated and may develop a reddish or purple color when lowered due to poor blood flow. D. Measuring joint range of motion assesses flexibility and mobility rather than the type of ulcer. While joint mobility issues can be associated with various conditions, including those affecting the vascular system, it does not directly help in distinguishing between venous and arterial insufficiency ulcers.