Investment can be defined as the part of money that a person invests or allocates in market or shares or any stocks or bonds, so as to yield profits in the future. One has to invest money wisely and by thoroughly studying the market trends and the person must know the highs and lows of the market.
B. living comfortably after you retire. This is the only answer as a good investment today can yield a great price tomorrow. So, a person can live comfortably with that money once he retires.