
Passage: A company has a six-story office building. The company's finance department, planning department, administration department, sales department, human resources department, R & D department and other six departments work here, each department occupies one floor. It is known that: (1) the floors of the human resources department and the sales department are not adjacent; (2) the finance department is on the lower floor of the planning department; (3) the floor of the administration department is above the planning department, but below the human resources department.
Question: Which of the followings may be the two departments on the first floor and the second floor, respectively?
A. A.Finance department, sales department
B. B.Planning department, sales department
C. C.R & D department, sales department
D. D.Sales department, planning department
Answer: