Choice "A" is correct. Under the IASB framework, going concern and accrual accounting are the two underlying assumptions of financial statement preparation and presentation.
Choice "b" is incorrect. This is a fundamental assumption under the FASB framework, not the IASB framework.
Choice "c" is incorrect. This is a fundamental assumption under the FASB framework, not the IASB framework.
Choice "d" is incorrect. This is a fundamental assumption under the FASB framework, not the IASB framework.