Which of the following most logically completes the argument?
A significant number of Qualitex Corporation’s department heads are due to retire this year. The number of employees other than current department heads who could take on the position of department head is equal to only about half of the expected vacancies. Oualitex is not going to hire department heads from outside the company or have current department heads take over more than one department, so some departments will be without department heads next year unless Qualitex ______.

A. promotes some current department heads to higher-level managerial positions
B. raises the salary for department heads
C. reduces the number of new employees it hires next year
D. reduces the average number of employees per department
E. reduces the number of its departments

OK. Q.C. (Qualitex Corporation) is retiring X no. of department heads but the expected no. of people who'll get promoted is x/2. No hiring from outside will take place, and no person will head more than one department. This means, half of the departments will remain 'headless' unless the number of departments is halved. Say, you merge sales and marketing into one department. You merge logistics and production into one department etc. etc. In such a scenario, you have only half the department heads but now you've halved the number of departments also. Hope it helps.