单选题 Study the following data, calculate the return on equity for 2007 and 2008.

	2007	2008
Pre-interest profit margin (EBIT/S)	0.3	0.15
Asset turnover (S/A)	2	2
Leverage multiplier (A/E)	2	2
Tax retention rate (1-t)	0.8	0.8
Interest expense ratio (I/A)	0.06	0.06

2007 2008
①A. 0.864 0.384
②B. 0.673 0.271
③C. 0.384 0.864
A. ①B. ②C. ③