Answer: D. code of ethics
Explanation:
Cofe of ethics are the principles that a company use in guiding its employees so that they can know what is either right or wrong according to the company. Code of ethics is typically used to guide workers and to protect them from doing anything that may portray the company in a bad image.
Since Ms. Martinez did not know how to respond to Mr. Tanner's gift, she thought an answer might be in her company's code of ethics. This will show her if collecting such gift is right or wrong.