I haven't had any reason to contact NCARB yet, but per page 16 of the ARE Guidelines:
INQUIRIES ABOUT SPECIFIC ARE QUESTIONS OR VIGNETTES
NCARB employs extensive quality control procedures throughout the development of the ARE. In spite of these procedures, typographical errors or flawed questions or vignettes may be encountered on rare occasion. If you suspect an error in a specific question or vignette, write to
customerservice@ncarb.org immediately after taking the test.
In your correspondence, include:
• the name of the division
• the test date
• the specific concern(s) about the question or vignette
You are not allowed to copy the question before leaving the test center and are not expected to recreate the entire question in your correspondence. NCARB will review the question, and you will be notified of the findings. The correct answer will not be revealed.