Question

when seated, the weight of the body is borne by the
obturator foramina.
ischial tuberosities.
iliac crests.
posterior inferior iliac spines.
inferior rami of the pubis.

Explanation:

The ischial tuberosities are the bony projections on the ischium (part of the hip - bone). When seated, the weight of the body is borne by these structures. The obturator foramina are large openings in the hip - bone and do not support body weight when seated. The iliac crests are the upper borders of the ilium and are not weight - bearing during sitting. The posterior inferior iliac spines are not involved in weight - bearing when sitting. The inferior rami of the pubis are also not the structures that bear body weight when seated.

Answer:

B. ischial tuberosities