Answer:
b. Debt ratio
Step-by-step explanation:
The liquidity ratio includes the current ratio, quick ratio, etc 
where, 
Current ratio = Total Current assets ÷ total current liabilities 
And, Quick ratio = Quick assets ÷ total current liabilities 
where, 
Quick assets = Cash and cash equivalents + short-term investments + Accounts receivable (net) 
These two ratios check the liquidity of the business organization whereas debt ratio shows a relationship between the total liabilities and the total assets. It checks the leverage of the firm whether it is capable to repay the borrowed amount or not 
Hence, option b is correct