Explanation:

• Higher investment increases the scope for future economic growth – creating a virtuous cycle of economic growth/investment. Increased research and development. High economic growth leads to increased profitability for firms, enabling more spending on research and development.
• High rate of investment brings high level of employment , increase in aggregate demand and increase in output.... Because If people invest more into the bank...the banks will provide loans to those people who wants to start a new business... As people wants to start new business they require employees Hence employment increases.... Again ,employees get wages As they get wages they demand different types of goods ... and Demand of goods leads to increase in output...

Hence option 4th is correct.