单选题 An analyst gathers the following information from a company's balance sheet (in millions):

	31 December 2011	31 December 2010
Cash and marketable securities	$66	$60
Receivables	$22	$20
Current assets	$132	$120
Total assets	$1498	$1345
Current liabilities	$242	$220
Total liabilities	$1189	$987

Based on the information, the company's liquidity ratios at the end of 2011 have:
A. decreased since the end of 2010.
B. remained the same since the end of 2010.
C. increased since the end of 2010.