Based on this selection, the code of conduct created by Cheng I was unique in its

The correct answer is B) completeness.

A code of conduct that is described as unique in its completeness would suggest that it thoroughly addresses various aspects of behavior and standards, leaving little out. This implies a well-rounded and comprehensive approach rather than being overly permissive, eccentric, or harsh. If you need more help or further explanations, feel free to ask!