I believe the answer is: A. Diverse & aggressive
Portofolio should be made into a diverse porfolio to ensure that the investor would not lose all of their capital if one investment fail. ( this should be done by all investors either old or young).
Young investors tend to better of to play aggressive investments since they are most likely do not have any family that they need to take care of, which mean that they would carry less emotional burden when choosing an investment.