Final answer:
Valencia can post her real estate license number and contact information on her website as this is necessary for transparency and building client trust; however, she should not post client testimonials without permission, misleading market information, or her personal opinions on unrelated controversial topics.
Step-by-step explanation:
When developing a website to promote her real estate services, Valencia must adhere to professional ethics and legal standards. One option she can confidently post on her site is d) Her real estate license number and contact information. This information is crucial for establishing trust with potential clients and is often a legal requirement for transparency in the real estate industry.
On the other hand, a) Testimonials from satisfied clients without their permission is not ethical and could potentially violate privacy laws. Similarly, b) Misleading information about the current real estate market is not only unethical but could also lead to legal repercussions if it is deemed deceptive. As for c) Personal opinions on controversial topics unrelated to real estate, while Valencia is entitled to personal opinions, posting them on a professional website could alienate potential clients and is generally considered unprofessional in the context of business promotion.