Step 1: Understanding the sociological context.
Recent sociological research in India has examined the consequences of a skewed sex ratio, particularly its effects on marriage patterns, gender roles, and social structures.
Step 2: Evaluating the options.
Option (A) is supported by research showing that shortage of women has led to cross-regional marriages, sometimes crossing caste boundaries.
Option (B) is endorsed as women are increasingly valued instrumentally for reproductive and care roles rather than empowerment.
Option (C) is incorrect because reduced female numbers have not improved women’s life chances; instead, vulnerabilities and exploitation often increase.
Option (D) is supported as sociologists note a male marriage squeeze due to the deficit of women.
Step 3: Conclusion.
Hence, statements (A), (B), and (D) are endorsed by recent sociological research.
Final Answer: (A), (B), (D)