Which of the following is considered a breach of ethical conduct in advertising?

Claiming to be the best based on popularity is considered a breach of ethical conduct in advertising because it presents a subjective and potentially misleading assertion. Ethical guidelines in psychology emphasize the importance of honesty, integrity, and respect in communication about services. Making a claim based on popularity lacks a factual basis that can be substantiated and can mislead potential clients into forming an unrealistic perception of the services being offered.

In contrast, advertising after-hours services, offering a free initial consultation, and promoting qualifications clearly are typically acceptable practices. These actions can enhance accessibility to psychological services, provide potential clients with an opportunity to assess a therapist's suitability, and ensure that qualifications are accurately represented, fostering informed decisions among clients. Thus, the integrity of the advertisement remains intact when these practices are utilized appropriately.