Process of elimination:
Flexibility is a characteristic because entrepreneurs are designing their own path (path being vague for whatever their entrepreneurship is focused on), allowing for flexibility
Risk is a characteristic because being on your own and doing your own thing is much more unstable than simply working for a well-founded company
Innovation is a characteristic, because the flexibility that comes from being an entrepreneur allows for freedom of ones own ideas, making innovation more likely.
Profit is not a particular characteristic, due to the risk factor.
Profit is the right answer :D