A. Theoretically, the debt ratio cannot exceed 80%. In practice, few creditors would extend loans to companies with exceedingly high debt ratios ( >70% ). B. Theoretically, the debt ratio cannot exceed 90%. In practice, few creditors would extend loans to companies with exceedingly high debt ratios ( >70% ). C. Theoretically, the debt ratio cannot exceed 70%. In practice, few creditors would extend loans to companies with exceedingly high debt ratios ( >70% ). ). Theoretically, the debt ratio cannot exceed 100%. In practice, few creditors would extend loans to companies with exceedingly high debt ratios ( >70% )