(A) Total Debt/Total Equity
The formula for Debt-Equity Ratio is: $\text{Debt-Equity Ratio} = \dfrac{\text{Total Debt}}{\text{Total Equity}}$
Source: Leverage/Capital Structure Ratios, Chapter 10
The examiner expects direct identification of the correct option. Debt-Equity Ratio measures relative contributions of creditors and owners. Option (B) is Debt-Asset Ratio, (C) is Fixed Assets Turnover, and (D) is Current Ratio — common distractors students must distinguish.