Clients have the right to refuse all of the following EXCEPT:

Clients do have a right to refuse services, terminate contracts, and request confidentiality regarding their data and information. However, when a client is in danger, the ethical guidelines and legal obligations of professionals, such as Registered Behavior Technicians (RBTs) and Board Certified Behavior Analysts (BCBAs), supersede the client's right to dictate confidentiality breaches. In situations where there is a risk of harm to the client or others, professionals are mandated to report information to safeguard the individual and ensure safety.

This means that while clients generally maintain control over their treatment choices and personal information, the responsibility to protect individuals from harm may override those rights in critical situations, which is why option C correctly represents an exception.