Russell Securities has $100 million in total assets and its corporate tax rate is 40%. The company recently reported that its basic earning power (BEP) ratio was 15% and its return on assets (ROA) was 9%. What was the company's interest expense?
A. $ 0
B. $ 2,000,000
C. $ 6,000,000
D. $15,000,000
E. $18,000,000