In the Left AIC/Right BC pattern, which statement best describes the right lower trapezius during thoracic counter-rotation?

• A. Right lower trapezius lengthens and aids right trunk rotation.
• B. Left lower trapezius lengthens and aids left trunk rotation.
• C. The right lower trapezius is longer and unable to help orient the spine back toward the left or to assist with right upper trunk rotation.
• D. Both lower trapezius muscles shorten and cooperate to rotate the thorax.

Answer: (C)