Final answer:
Professional codes of ethics provide a complete and reliable guide to one's moral obligations in the field of business.
Step-by-step explanation:
The benefits of moral standards are best seen in option c) Professional codes of ethics provide a complete and reliable guide to one's moral obligations.
The field of business, like other professions such as nursing and teaching, has professional organizations that issue codes of ethics. These codes outline the moral obligations that professionals should follow in order to maintain membership in their respective organizations. By adhering to these professional codes of ethics, individuals can ensure that their actions align with moral standards and contribute to the overall ethical conduct of the profession.