You are evaluating the capital structure of two companies, Company C and Company D, for the fiscal year 2023.

Company	Total Liabilities (in millions)	Shareholders' Equity (in millions)
Company C	$150	$200
Company D	$100	$300

Requirements:

1. Calculate the debt-to-equity ratio for both Company C and Company D.
2. Compare the capital structures of Company C and Company D based on their debt-to-equity ratios.
3. Discuss potential implications of the differences in debt-to-equity ratios between Company C and Company D.