Answer
(b) ilium
Work Step by Step
The ilium is a large flaring bone that forms the superior region of a coxal bone. It consists of a body and a superior winglike portion called the ala. When you rest your hands on your hips, you are resting them on the thickened superior margins of the alae, the iliac crests, to which many muscles attach (page 234).
Just inferior to the posterior inferior iliac spine, the ilium indents deeply to form the greater sciatic notch through which the thick cordlike sciatic nerve passes to enter the thigh (page 235).
