During an Examination of a Patient's Abdomen,the Nurse Notes That

During an examination of a patient's abdomen,the nurse notes that the abdomen is rounded and firm to the touch.During percussion,the nurse notes a drumlike quality of the sounds across the quadrants.This type of sound indicates:

A) Constipation.
B) Air-filled areas.
C) Presence of a tumor.
D) Presence of dense organs.