Final answer:
Entity A, as a first-time adopter of IFRS, has decided to prepare separate financial statements in accordance with IAS 27.
Step-by-step explanation:
In the context of International Financial Reporting Standards (IFRS) and the preparation of separate financial statements under IAS 27, if Entity A has elected to measure its investments in subsidiaries at cost, the option "Equity method" is not one of the amounts at which Entity A can measure these investments in its separate opening IFRS statement of financial position.
The available options for measuring investments in the separate financial statements are usually:
Cost: This is the amount originally paid for the investment.
Fair Value: The current market value of the investment.
Net Realizable Value: This is more relevant to assets that will be sold rather than investments in subsidiaries.
Equity Method: This involves recognizing the investee's post-acquisition profits or losses in the investor's statement of profit or loss and other comprehensive income.
Since Entity A has elected to measure its investments at cost, the equity method, which involves recognizing post-acquisition profits or losses, would not be used for measuring these investments in the separate opening IFRS statement of financial position.