Which of the following are parts of the pelvis?

The correct answer highlights specific anatomical structures that are part of the pelvis. The pelvis is a vital structure in the skeletal system, primarily involved in supporting the weight of the upper body when sitting or standing, and it serves as a conduit for nerves and blood vessels between the trunk and the lower limbs.

The ilium is the largest part of the hip bone, contributing to the upper section of the pelvis. The pubic symphysis is the cartilaginous joint that connects the left and right pubic bones, completing the formation of the pelvis at the front. The iliac crest is the top border of the ilium, providing attachment points for various muscles and ligaments and also playing a role in the pelvic structure.

The other answer choices refer to different anatomical groups that do not directly pertain to the pelvis itself. Tendons, ligaments, and muscles are components of the body's musculoskeletal system but are not part of the pelvic bone structure. The heart, arteries, and veins belong to the cardiovascular system, while kidneys, ureters, and the bladder are components of the urinary system. Thus, only the first choice focuses on specific elements that constitute the anatomy of the pelvis.