Step 1: Recall Kehr's sign.
Kehr's sign is referred left shoulder tip pain from splenic injury or diaphragmatic irritation
Step 2: Recall Boas' sign.
Boas' sign is tenderness below the right scapula, classically linked with gall bladder disease
Step 3: Recall Grey-Turner's sign.
Grey-Turner's sign is flank bruising seen in retroperitoneal bleeding, such as in severe pancreatitis
Step 4: Match them in order.
Matching each sign to its description in sequence gives 1-A, 2-B, 3-C
\[ \boxed{1-A, 2-B, 3-C} \]