Final answer:
The pelvic girdle consists of the ilium, ischium, pubis, and sacrum, which together form the pelvis, supporting body weight and providing muscle attachment. The correct option is b.
Step-by-step explanation:
The pelvic girdle is composed of four bones, which are the ilium, the ischium, the pubis, and the sacrum. These bones are fused in adults to form two hip bones, which come together at the front to form the pubic symphysis and at the back are joined to the sacral bone.
Collectively, these create the pelvis structure. The pelvis supports the upper body's weight while sitting and standing, and it provides attachments for and with the muscles of the abdominal wall, the internal and external organs of the pelvis, the lower back, the buttocks, and the legs.
It also makes up the birth canal in females. The correct option is b.