Final answer:
The finance function is responsible for the economic analysis of investment proposals and provision of funds. Investment decisions are not based on the current level of national income but on expectations about future economic growth and interest rates.
Step-by-step explanation:
The activities associated with economic analysis of investment proposals, and provision of funds are functions of the finance function. Therefore, the correct answer is D. finance function. Financial functions include tasks such as budgeting, financial forecasting, managing cash flow, and providing funds for business activities. Investment functions specifically, as depicted in figures like Figure B3, involve the assessment of interest rates, future expectations, and the shifts in investment based on various economic indicators. Investment does not change with the current level of national income, because it is forward-looking and based on expectations about future economic growth.