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 drum-like quality of the sound across the quadrants.This type of sound indicates:

A) constipation.
B) air-filled areas.
C) the presence of a tumor.
D) the presence of dense organs.