Answer: B. The smoking regulations allow all employees who smoke an equal opportunity to do so, regardless of an employee's job level
Step-by-step explanation:
Based on the scenario that we have in the question, the option that strengthens the employees' argument is that the smoking regulations allow all employees who smoke an equal opportunity to do so, regardless of an employee's job level.
In this case, there's actually a justification for the employees demand of enclosed offices since the smoking regulations allow all the workers who smoke an equal opportunity to do so.
Hence, this particular option strengthens their argument. The other options doesn't support the argument of the employees.