It is essential to standardise the accounting principles and policies in order to ensure

Standardizing accounting principles and policies serves multiple purposes: Transparency - clear, understandable financial reporting; Consistency - same methods applied over time and across similar transactions; Comparability - financial statements can be compared across different companies and periods. The question asks what standardization ensures, and all three outcomes are achieved through standardization. Without standardization, each company might use different methods, making comparisons impossible and reducing transparency. Therefore, the answer is D (all of the above).