According to the new office smoking regulation, only employees who have enclosed offices may smoke at their desk virtually all employess with enclosed offices are at the professional level and virtually all secretarial employees lack enclosed offices.Therefore, secretaries who smoke should offered enclosed offices. Which of the  following is an assumption that enables the conclusion above to be properly drawn?

A    Employees at the professional level who do not smoke should keep their enclosed offices

B    Employees with enclosed offices should not smoke at their desks, even though the new regulations permit them to do so

C    Employees at the secretarial level should be allowed to smoke at their desks even if they do not have enclosed offices

D    The smoking regulations should allow all employees regardless of an employee job level