I'll tell you to go for option B. The reason is because you do not have to put all your money into an investment. I am assuming that in this scenario, the money you have listed above is your entire money. To have a bigger and safer investment, you can invest 10k and keep 5k that is left for other businesses, an emergency fund, and other daily expenses until your investment starts to yield returns. Although if your investment starts giving a return, i won't advise you to start touching your investment profit yet, it is good that you start using a little profit from your business first and let your investment grow more.