The nurse is observing the auscultation technique of a student nurse. What is the correct method to use when progressing from one auscultatory site on the thorax to another?

A. Top-to-bottom comparison is not the best method for auscultation. A more systematic approach is needed. B. Posterior-to-anterior comparison does not apply to all auscultation areas, and a consistent method across the thorax is preferred. C. Interspace-by-interspace comparison involves comparing sounds across different intercostal spaces but is not a method for transitioning between sites. D. Side-to-side comparison ensures the nurse is assessing both sides of the thorax equally and systematically, which is the correct approach.