Builder: Within ten years, most of the new homes constructed in North America will have steel frameworks rather than wood ones. After all, two-by-fours and two-by-sixes -- the sizes of lumber most commonly used in home construction -- are deteriorating in quality and increasing in cost, while environment-friendly steel is decreasing in cost. In addition, unlike wood, steel will not warp, rot, or split. Which one of the following, if true, most seriously weakens the builder's reasoning?
A: Training home construction workers to work with steel is very costly.
B: Steel-framed homes do not have to be treated with pesticides or other chemicals that can contribute to indoor air pollution.
C: Because lumber prices have increased over the last decade, currently most new homes are built with steel frameworks.
D: The number of houses built each year is expected to decrease over the next decade.
Choose A, B, C or D as your solution.
A