A strong work ethic is vital to a company achieving its goals. Every employee, from the CEO to entry-level workers, must have a good work ethic to keep the company functioning at its peak. A work ethic is a set of moral principals an employee uses in his job. Certain factors come together to create a strong work ethic.
The answer is A. Transition
Divorce and changing schools is also considered a transitions.
An enviromental change could trigger a drug abuse for teens because it forced them to adapt (socialize with friends, etc)