Which of the following would explain a companys inventory turnover ratio falling from 4 to 2.5?

• a.)

  The company's cost of goods sold has decreased while the average inventory has remained constant.

• b.)

  The company's cost of goods sold has increased while the average inventory has remained constant.

• c.)

  The company's cost of goods sold has increased while the average inventory has decreased.

• d.)

  The company's cost of goods sold has remained constant while the average inventory has decreased.