Brixton has provided the following information relating to the non-current assets of his business for the year ended 31 December 2021. Carrying amount at 1 January 2021 50,000 Carrying amount at 31 December 2021 46,000 Cost of non-current assets sold 4,000 Accumulated depreciation of assets sold 1,500 Depreciation for the year 9,000 What amount should be presented as an "Investing activity" in the Statement of cash flows? O a. 10,000 O b. 9,000 O c. 7,500 O d. 4,000