Answer: 0.25.

The correct answer is **A** (0.25). The total debt ratio is calculated as total debt divided by total assets, which is 100 / 400 = 0.25. - **Option B** (0.50) is incorrect because it calculates the debt-to-equity ratio (total debt / total equity = 100 / 200 = 0.50) or mistakenly uses total liabilities divided by total assets (200 / 400 = 0.50). - **Option C** (2.00) is incorrect because it calculates the financial leverage ratio (total assets / total equity = 400 / 200 = 2.00).

Author: LeetQuiz Editorial Team