Which bones are part of the pelvic girdle?

The bones that constitute the pelvic girdle are specifically the ilium, ischium, and pubis. These three bones fuse together to form the hip bone, also known as the coxal bone. The pelvic girdle plays a critical role in supporting the weight of the upper body when sitting or standing, facilitating locomotion, and providing attachment points for various muscles involved in movement.

When considering the other options, the choice that includes the radius, ulna, and humerus pertains to the upper limb, specifically the bones of the arm, and therefore does not relate to the pelvic girdle. Similarly, while the coccyx and sacrum are important parts of the vertebral column located in the lower body, they are not classified as components of the pelvic girdle. The inclusion of phalanges and femur with pubes also does not identify the elements of the pelvic girdle but rather refers to bones of the lower limbs. Thus, the answer that correctly identifies the bones comprising the pelvic girdle is the one that names the ilium, ischium, and pubis.