Final answer:
The correct answer is D) Circular fibers, as the trapezius muscle consists of upper, middle, and lower fibers which are responsible for different movements of the scapula and neck, not circular fibers.
Step-by-step explanation:
The correct option : d
The trapezius muscle can be separated into upper fibers, which elevate the scapula and extend the neck, middle fibers, which retract the scapula, and lower fibers, which depress the scapula and assist in its rotation during the raising of the arm. The trapezius muscle is a major muscle of the back, playing an important role in stabilizing and moving the shoulder blades as well as supporting the arm. Each of the fiber groups of the trapezius has distinct functions. The upper fibers elevate or upwardly rotate the scapula, such as when shrugging your shoulders.
The middle fibers are responsible for retracting the scapula, pulling it towards the spine, which is necessary for maintaining good posture. The lower fibers depress the scapula by pulling it downwards and assist in its rotation when lifting the arm above the head. Circular fascicle arrangements, mentioned in one of the provided references, are typical of muscles that act as sphincters to close orifices, which is not a function associated with the trapezius muscle.