There are two statements marked as Assertion (A) and Reason (R). Mark your answer as per the options given below.

Assertion (A):  Debt to Equity Ratio shows the relationship between Debt and Shareholders' Funds and indicates the long-term financial soundness of the enterprise.
Reason (R):  The ratio is the comparison of Debt with shareholders' Funds. A higher ratio may be riskier than it should be.

Both, Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A).

Debt-Equity Ratio measures the relationship between long-term debt and equity. If debt component of the total long-term funds employed is small, outsiders feel more secure. From security point of view, capital structure with less debt and more equity is considered favourable as it reduces the chances of bankruptcy. Normally, it is considered to be safe if debt equity ratio is 2 : 1. However, it may vary from industry to industry. It is computed as follows: Debt-Equity Ratio = Long − term Debts Shareholders’ Funds.
This ratio measures the degree of indebtedness of an enterprise and gives an idea to the long-term lender regarding extent of security of the debt. As indicated earlier, a low debt equity ratio reflects more security. A high ratio, on the other hand, is considered risky as it may put the firm into difficulty in meeting its obligations to outsiders. However, from the perspective of the owners, greater use of debt (trading on equity) may help in ensuring higher returns for them if the rate of earnings on capital employed is higher than the rate of interest payable.