The correct answer is: A. AS 11
AS 11 is the Accounting Standard on Consolidated Financial Statements. It prescribes the principles and procedures for preparing and presenting consolidated financial statements of a holding company and its subsidiaries.
AS 21 is the Accounting Standard on Accounting for Investments in Associates. It prescribes the accounting treatment for investments in associates, which are entities over which the investor has significant influence but not control.
AS 22 is the Accounting Standard on Accounting for Investments in Joint Ventures. It prescribes the accounting treatment for investments in joint ventures, which are entities over which the investor has joint control with other investors.
AS 23 is the Accounting Standard on Financial Reporting of Interests in Joint Ventures. It prescribes the disclosures that should be made in the financial statements of an investor in a joint venture.
The preparation of consolidated financial statements is a complex process that requires a thorough understanding of the accounting standards. It is important to consult with a qualified accountant to ensure that the consolidated financial statements are prepared in accordance with the applicable accounting standards.