Final answer:
The inlet of the pelvic girdle is labeled as the Sacrum, and the outlet is labeled as the Ilium, which corresponds to Option D.
Step-by-step explanation:
The correct labels for the inlet and outlet of the pelvic girdle are Inlet: pelvic brim and Outlet: inferior opening of the lesser pelvis. Specifically, the pelvic inlet (or pelvic brim) is defined by the upper margin of the pubic symphysis, pectineal line of the pubis, arcuate line of the ilium, and the sacral promontory. Conversely, the pelvic outlet is defined by the inferior margin of the pubic symphysis, right and left ischiopubic rami, Sacro tuberous ligaments, and the tip of the coccyx. Therefore, the correct label according to the options provided is Option D: Inlet: Sacrum; Outlet: Ilium.