In 2015 Camilles Pet Store Inc reported an ROA of 9.24%, Roe of 15.8% and profit margin of 21.2%. The firm had total assets equal to $12.8 million at the end of 2015. What's common stockholders equity as of year end 2015 for Camillas Pet Stores Inc., A. $6.7 million B. $9.3 million C. $8.1 million D. $7.5 million