单选题 A rectangular tabletop consists of a piece of laminated wood bordered by a thin metals trip along its four edges．The surface area of the tabletop is x square feet，and the total length of the strip before it was attached was x feet．If the tabletop is 3 feet wide，what is its approximate length，in feet?
A. 12 B. 10 C. 9
D. 8 E. 6