Answer: D. must purchase shares of the open end fund in the primary market from the investment company and shares of the closed end fund in the secondary (stock) market.
Explanation:
Open ended funds have the power to issue unlimited shares and sells directly to investors which means that to purchase from them after they have launched, one would need to do so through the primary market from the investment company itself.
Closed-end funds however raise a fixed capital by issuing an Initial Public Offering and then the shares of the fund will then be listed in a stock exchange. To buy into such funds after a few years, you will have to go through the secondary market and buy it in the stock market.