Kroger's 2016 financial statements show net operating profit after tax of $2,286 million, net income of $1,975 million, sales of $115,337 million, and average net operating assets of $18,616 million. Kroger's net operating asset turnover for the year is: A. 12.3% B. 8.11 C. 6.20 D. 10.9% E. There is not enough information to calculate the ratio.