The correct option is D Acromion process Acromion process is a bony process on the scapula that articulates with the clavicle to form the acromioclavicular joint. The femur meets with the pelvis at the acetabulum cavity. The ball and socket joint is a type of synovial joint. Glenoid cavity is located on the lateral angle of the scapula. So, the correct answer is 'acromion process'.