题目选项分析

The recent boom in new home construction has finally begun to taper off. Developers are not buying land, contractors are finding themselves going without work for longer periods, and banks are issuing fewer mortgages. People must not be as interested in buying new homes as they were even six months ago. Which of the following indicates a flaw in the reasoning above?

【选项】The cost of materials such as lumber and cement has decreased over the past year