Answer:
The answer is: D) The employer offers stock options, which require the employee to work for a ...
Explanation:
The complete answer should include "...work for a specific amount of time."
If you want to hold an employee, at least for a reasonable amount of time, you must use some benefit that the employee will probably want to obtain. But that benefit should be obtainable only if he stays for some specific amount of time.
Some companies offer employees the opportunity to become partners if they keep working for X amount of years and perform their jobs flawlessly.
The amount of time shouldn't be so long that the employee believes it is unobtainable, but it should be long enough for the employer to benefit from the employee's work. You must remember that when you work, you get a benefit (wage) and your employers gets a benefit also (ideally a job well done).
