Final answer:
To listen to a neonate's heart in the RSA position, the stethoscope should be placed on the left upper chest area, where the heart is located nearer to the chest wall and is the most anterior.
Step-by-step explanation:
When determining where to listen to the heart of a neonate in the right side-lying (RSA) position, it is important to understand the orientation of the heart within the thoracic cavity. The heart is centrally located within the thoracic cavity, with the apex directed toward the left side, between the fourth and fifth ribs near their articulation with the costal cartilages. To auscultate the neonate's heart in the RSA position, you would place the stethoscope on the chest area where the heart is most anterior, which would typically be the left upper chest area (Answer A). Knowing the heart's positions, such as the great arteries and veins at the base, and the apex of the heart, assists healthcare professionals in accurately assessing heart sounds.