Read the following short passages and choose the best answers to the questions that follow each passage.
Although measuring the productivity of outsourced workers is a complex endeavor. Company X, which relies heavily on outsourced workers, must find ways to assess the performance of these workers. The risks to a company that does not review the productivity of its human resources are simply too great. Last year, Company Y was forced into receivership after its productivity declined for three consecutive quarters.
The clauses in the italics in the above paragraph, play which of the following roles in the argument above ?