Answer:
Equity
Step-by-step explanation:
The choice should be very straight forward, the company doesn't generate enough cash, and if it takes debt, it will not be able to pay it back. The only choice for raising capital is through issuing equity.
This is something normal for many startups, e.g. FB, Amazon, Google, etc., all got financed through equity for several years before being able to issue debt. Of course debt is cheaper than equity, but it also poses a risk for the company.