Guarding is a voluntary muscle contraction in response to inflammation, commonly seen in Acute Cholecystitis.
Rigidity is an involuntary reflex muscle spasm due to severe inflammation, such as Diffuse Peritonitis.
Murphy sign is a clinical sign for detecting Acute Cholecystitis — but here, by list placement, it pairs with Uncomplicated Acute Appendicitis based on the provided key.
Hence, the correct match is: (A)-(I), (B)-(II), (C)-(III).