Final answer:
Pain with activity but not while resting indicates arterial insufficiency in the legs, known as intermittent claudication, a symptom of Peripheral artery disease (PAD).
Step-by-step explanation:
The assessment finding that indicates arterial insufficiency in a client's legs is pain with activity but not while resting. This is known as intermittent claudication and is a classic symptom of Peripheral artery disease (PAD). Other symptoms of PAD include skin ulcers, bluish skin, cold skin, or poor nail and hair growth in the affected leg(s). The other options such as ankle discoloration and pitting edema, dependent mottling and absence of hair, and full veins present in the dependent extremity are more indicative of other conditions such as venous insufficiency or varicose veins.