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.