When Percussing a Patient's Abdomen to Gather Assessment Data, the Nurse

When percussing a patient's abdomen to gather assessment data, the nurse must rely most heavily on which ability?

A) Locating the margins of the various abdominal organs
B) Differentiating the various elicited sounds
C) Supplementing the technique with fine finger dexterity
D) Observing subtle variations in the contour of the abdomen