In Doppler echocardiography, what does a lower returning frequency indicate about RBC motion relative to the transducer?

• A. RBCs Moving Toward The Transducer (Above Baseline)
• B. No Doppler Shift Is Observed
• C. RBCs Moving Away From The Transducer (Below Baseline)
• D. Flow Is Laminar With No Directional Change

Answer: (C)