What happens if the Right BC does not disengage?

• A. If the Right BC doesn't disengage, the Left BC will not be able to reciprocally direct the upper thorax back into right rotation.
• B. If the Right BC doesn't disengage, the Left BC will cause the thorax to rotate further into left rotation.
• C. There will be no effect on thorax rotation.
• D. The Right BC will disengage automatically.

Answer: (A)