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The correct answer highlights the relationship between tissue density and the efficiency of reflection of ultrasound waves. Denser tissues possess higher acoustic impedance, which is the measure of resistance a material provides to the transmission of ultrasound waves. When ultrasound waves travel from a less dense to a denser medium, a greater proportion of the waves is reflected back at the interface due to the difference in acoustic impedance. This property is critical in diagnostic imaging, as it allows for the visualization of the internal structures and boundaries of tissues.

While denser tissues do absorb some ultrasound waves, the key factor in ultrasound imaging is the reflection at interfaces, which provides the contrast necessary for creating images. Other options mention absorption or suggest a lack of influence from tissue density, which does not account for the significant role tissue composition and structure play in how ultrasound waves interact with different mediums. Understanding this interaction is essential to interpreting ultrasound images and ensuring accurate diagnostics.