The correct answer is option 'D', which states that all of the above options are correct. Let's discuss each of these options in detail:

a) Harmonise accounting policies:
Accounting standards aim to harmonize accounting policies by providing guidelines and rules for preparing financial statements. These standards ensure that companies follow similar accounting principles, methods, and practices when recording and reporting their financial transactions. Harmonizing accounting policies promotes consistency and comparability in financial reporting, making it easier for users of financial statements to analyze and compare the financial performance and position of different companies.

b) Eliminate the non-comparability of financial statements:
One of the primary objectives of accounting standards is to eliminate non-comparability of financial statements. Non-comparability arises when companies adopt different accounting policies or methods for similar transactions or events. This can lead to variations in financial reporting, making it difficult for users to make meaningful comparisons. Accounting standards provide guidance on selecting appropriate accounting policies and methods, ensuring that financial statements are comparable across different entities and periods.

c) Improve the reliability of financial statements:
Another objective of accounting standards is to improve the reliability of financial statements. Reliability refers to the accuracy, completeness, and neutrality of the information presented in financial statements. Accounting standards establish rules and principles that enhance the reliability of financial reporting by requiring companies to provide relevant and reliable information, use appropriate estimation techniques, disclose necessary details, and follow consistent accounting policies. This promotes transparency and helps users make informed decisions based on reliable financial information.

In summary, accounting standards play a crucial role in harmonizing accounting policies, eliminating non-comparability, and improving the reliability of financial statements. These objectives ensure that financial reporting is consistent, comparable, and provides reliable information to users. By following accounting standards, companies can enhance the usefulness and credibility of their financial statements, thereby benefiting various stakeholders such as investors, creditors, regulators, and the general public.