单选题 An analyst does research about security market indices and gathers the following information about market-capitalization-weighted index consisting of the shares of three companies:

Company	Beginning Share Prices	Ending Share Prices	Dividends Per Share	Shares Outstanding
A	$26	$21	$1.60	300
B	$51	$46	$2.10	300
C	$11	$13	$3.10	400

The price retum on the index is closest to:
A. -16.55%
B. -8.00%
C. 0.55%