Presented below is information from Solo Inc.'s financial statements:

(In millions)		Year 2	Year 1
Balance sheet
	Total assets	$34,310	$32,754
	Shareholders' equity	6,304	7,878
Income statement
	Net sales	$35,372	$35,034
	Net income	4,330	3,930

During Year 2, the company paid preferred dividends totaling $1,440 million. How much is the rate of return Solo generated for its common shareholders during Year 2?

a.68.7%

b.45.8%

c.6.7%

d.12.2%