Final answer:
The true statement is that the psoas major and iliacus extend the hip joint.
Step-by-step explanation:
The statement that is true is option C: The psoas major and iliacus extend the hip joint.
The psoas major and iliacus muscles are part of the iliopsoas group, which consists of two muscles that work together to flex, extend, and rotate the hip joint. The psoas major originates from the lumbar vertebrae, while the iliacus originates from the iliac fossa of the pelvis. When these muscles contract, they extend the hip joint, moving the thigh bone away from the body.