The correct answer is D) Futures.
If an investor possesses a portfolio heavily concentrated in Certificates of Deposit, a financial advisor would most likely suggest an aggressive investment to diversify the portfolio. In this case, it should be "Futures."
Financial experts consider "Future Markets" as a place where investors buy and sell a commodity. Futures obligate investors to the exchange of an asset in a date specified in the future at a specific price, regardless of the market price at that moment. An example of a future market can be the New York Mercantile Exchange.