Passage Summary: There is a rule saying you shouldn't profit from a coworker's mistake; the author applies this to Mark, who used a coworker's client list to help his own career.

Conclusion: Mark's action of using his coworker's client email addresses to advance his career was unethical.

Reasoning: There is a general principle that it is unethical to profit from a coworker's error, and Mark used Rashmi's client list for his own professional gain.

Analysis: To justify this application, we need to bridge the gap between the general principle and the specific case. The principle only applies if an 'error' was made, but the application never explicitly states that Rashmi's email addresses became available to Mark because of an error. If she gave them to him intentionally or if he stole them, the 'error' principle wouldn't necessarily apply. Look for an answer that confirms Rashmi's loss of the email addresses was indeed the result of a mistake.