Which of the following actions is deemed unprofessional conduct under regulatory provisions?

The correct choice identifies that violating any provisions in RCW 18.235.020 constitutes unprofessional conduct. This particular section of the Revised Code of Washington outlines specific actions and ethical standards that practitioners in the funeral industry must adhere to in order to maintain a professional and lawful practice. Violations of these provisions can include misconduct, fraud, or any behavior deemed harmful or deceptive in the context of providing funeral services. As such, any infringement on these regulations reflects an unprofessional approach to the responsibilities that come with being a funeral director, which can ultimately undermine public trust in the profession.

In contrast, advertisements promoting services, offering free consultations, and providing customer feedback forms are generally considered acceptable and professional practices within the industry, as they enhance transparency and service delivery, given they comply with regulatory guidelines.