Which abnormality is depicted in the image below?

A. Often referred to as "pigeon chest," pectus carinatum is a condition where the chest protrudes outward. This deformity makes the chest appear to bulge forward, giving it a distinctive "pigeon-like" appearance. B. Barrel chest is characterized by an increased anteroposterior (AP) diameter of the chest, giving it a rounded, barrel-like appearance. This can occur due to conditions such as chronic obstructive pulmonary disease (COPD) or emphysema. C. Scoliosis is a lateral curvature of the spine, which can cause a noticeable asymmetry in the rib cage and back. It often presents as a side-to-side curve in the spine, which can lead to an uneven shoulder height and a visibly curved back when viewed from the side. D. Known as "funnel chest," pectus excavatum is a condition where the breastbone (sternum) is sunken into the chest. This causes a noticeable depression in the middle of the chest and may appear as a concave or hollowed area.