The correct answer is C: Long-term investments.

Current assets are assets that can be converted to cash within one year or one operating cycle. They include cash and cash equivalents, accounts receivable, inventory, and short-term investments. Long-term investments are non-current assets as they are held for more than one year.

The correct answer is A: Current Assets / Current Liabilities.

The current ratio measures a company's ability to pay off its short-term liabilities using its short-term assets. A ratio above 1 indicates the company has more current assets than current liabilities, suggesting good short-term liquidity. A ratio below 1 may indicate potential liquidity problems.