Kent Inc Provided the Following Data for 2016 and 2017

Kent Inc. provided the following data for 2016 and 2017:
$$\begin{array} { l r } \textbf { Inventory } & \\\quad \text { December 31, 2016 } & \$ 250,000 \\\quad \text { December 31, 2017 } & 180,000 \\\textbf { Cost of goods sold } & \\\quad 2016 & \$ 650,000 \\\quad 2017 & 645,000 \\\textbf { Gross margin } & \\\quad 2016 & \$ 340,000 \\\quad 2017 & 430,000\end{array}$$ What are the inventory turnover ratio and the gross margin return on inventory investment for 2017?

A) Inventory turnover ratio = 3.00 times and the Gross margin return on inventory investment = 2%
B) Inventory turnover ratio = 2.00 times and the Gross margin return on inventory investment = 300%
C) Inventory turnover ratio = 3.09 times and the Gross margin return on inventory investment = 20%
D) Inventory turnover ratio = 3.00 times and the Gross margin return on inventory investment = 200%