Scenario: Jack considers an investment

JackJack is off to a good start financially. He has minimized his expenses, built up his savings, and recently started to invest. Some friends of his have a fantastic new business idea and have asked him to invest, but don’t have a business plan yet. He’d have to quickly sell the investments he’s made so far to give them the money they need. His investments are low-risk but haven’t earned much. Is this his chance for a huge profit?
Given his situation, which choice do you think is best?