Final answer:
Postures associated with a posteriorly tilted pelvis are sway back and flat back (option C). Sway back often has more of an anterior pelvic tilt due to lordosis, but flat back posture can involve a posterior pelvic tilt.
Step-by-step explanation:
The postures associated with a posteriorly tilted pelvis are C) sway back and flat back. A posterior tilt of the pelvis is characterized by the top of the pelvis tilting backward. The sway back posture is typically associated with an excessive anterior curvature of the lumbar region, which leads to a pronounced lordosis, or swayback. However, this curvature results in an anterior tilt of the pelvis rather than a posterior tilt. The flat back posture, on the other hand, has reduced lumbar curvature and can be associated with a posterior pelvic tilt. The military type posture would most likely feature an exaggerated lordosis with an anterior pelvic tilt, which does not match the characteristics of a posteriorly tilted pelvis. Therefore, option C is the correct answer.