Final answer:
The Ethical Principles in Planning were adopted in July 2003, which is option B.
Step-by-step explanation:
The Ethical Principles in Planning were adopted in July 2003. This date corresponds with option B and reflects the adoption by the American Institute of Certified Planners, which is a professional institute of the American Planning Association. The Code of Ethics that you have referenced from the American Sociological Association was adopted in 1999, which is not the correct year in question for the Ethical Principles in Planning.