Which of the following can lead to license denial or disciplinary action?

The correct choice reflects that specific actions or behavior can indeed lead to license denial or disciplinary action. In the context of psychology laws and regulations, various unprofessional or unethical behaviors, such as violations of ethical standards, criminal activities, or dishonesty in applications or professional conduct, can trigger disciplinary measures from licensing boards. These boards have the authority to assess whether a professional meets the standards and ethics required to maintain a license. Engaging in acts that violate these standards can significantly impact one's ability to practice legally and reputably.

The other options involve positive or neutral actions that typically reflect good professional practice or personal achievement. Completing required educational hours, community volunteering, and maintaining high grades are all commendable activities that contribute positively to a professional's qualifications and community service but do not inherently indicate any grounds for disciplinary action or license denial. In contrast, option B specifically acknowledges the relevance of harmful behaviors that can lead to serious consequences within the profession.