One way to furnish a living room is with modular furniture. Instead of ... ...

One way to furnish a living room is with modular furniture. Instead of buying a standard sofa, for example, one can buy a left end, a right end, and a middle piece that can be combined to create an L-shaped sofa. Modular furniture, however, is far more expensive than standard furniture. On average, a three-piece modular sofa costs almost twice as much as a standard sofa of comparable size and quality. Each of the following, if true, helps to account for the greater cost of modular furniture EXCEPT:
(A) Modular furniture, unlike standard furniture, is not mass-produced.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning A