Choice A rationale:

This statement is incorrect.

Buttock pain in Ankylosing Spondylitis is not solely related to physical activity; it can occur at any time, and it often worsens with inactivity or prolonged periods of sitting.

Choice B rationale:

This statement is not entirely accurate.

While pain in the hips can occur in Ankylosing Spondylitis, it is not limited to the morning.

The hallmark feature is morning stiffness in the lower back.

Choice C rationale:

This statement is incorrect.

Pain in the thighs is not typically associated with Ankylosing Spondylitis, and it does not improve with rest.

Choice D rationale:

This statement aligns with the symptom of sacroiliitis, which is a common feature of Ankylosing Spondylitis.

Pain in the buttocks can indeed extend to the hips in individuals with this condition, especially when the inflammation affects the sacroiliac joints.