What role does the IASB play in accounting standards?

The IASB, or International Accounting Standards Board, is primarily responsible for the development and publication of International Financial Reporting Standards (IFRS), as well as the International Accounting Standards (IAS). The role of the IASB is crucial in promoting transparency, accountability, and efficiency in financial markets around the world, as it establishes globally accepted financial reporting standards.

By setting these standards, the IASB helps ensure that financial statements are comparable across borders, contributing to the reliability and clarity of financial information. This is essential for investors and stakeholders who rely on accurate financial reporting when making decisions. The standards set by the IASB are adopted by many countries and are used by a vast number of organizations operating internationally, making them a cornerstone of modern financial reporting practice.

Other roles mentioned, such as filing financial statements at Companies House or providing financial guidance to shareholders, do not fall under the IASB's responsibilities. Additionally, while the IASB is related to the IFRS Interpretations Committee, it does not manage this committee, which operates independently to enhance the clarity and application of IFRS. Thus, the primary function of setting IFRS confirms why the given answer is the correct choice.