Anatomy of the Underlying Tissues Has What Type of Effect

Anatomy of the underlying tissues has what type of effect on the impedance and absorption of ultrasound?

A) The number of liquids in the underlying tissue will dissipate the acoustical energy.
B) The number of tissue layers in the underlying area will not affect the absorption of ultrasound.
C) The density of the structural components has no effect on the impedance or absorption of ultrasound.
D) The density of the tissues and the number of different structural components within it will help dissipate or absorb the acoustical energy of ultrasound.