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Option B clearly states that resolves the paradox why Vignola Construction had the slowest roofing project completion timelines of these 15 firms.
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Vignola Home Repairs had the fastest roofing project completion timelines of the top 15 home repair firms in Italy, from January to April 2007. From May to September 2007, Vignola Construction had the slowest roofing project completion timelines of these 15 firms. The roofing project completion timelines of the other 14 firms relative to each other remained unchanged.

Which among the following statements, if true, would best help to explain the facts mentioned in this question?

A. Vignola Home Repairs increased its roofing project rates in May 2007 to compensate for increased material costs, and doing so bought down roofing project revenue by 12 percent.
B. Vignola Home Repairs works in regions that experience heavy rainfall during the summer, whereas the other construction firms work in regions that experience moderate rainfall.
C. In May 2007, Vignola Home Repairs replaced seven old cranes with new ones; the new cranes suffered from fewer breakdowns than the old ones.
D. In May of 2007, Vignola Home Repairs started a financial incentive program for its construction staff for projects completed on time, but the other 14 firms took no such initiative.
E. A new labor policy introduced in May 2007 caused labor unions of all constructions firms across Italy to go on strike for two weeks.

B is the best choice.

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