What If Project Is Calculated With Very Small Margin During Operations?

You have recently been assigned as a project manager to a new B-O-T (Build, Operate, Transfer) capital project. Reviewing the initial documentation you found out that it has been calculated with a very small margin during operations of its product for the shareholders. What should you do?

A. As you are not responsible for lifecycle costing, you don't have to worry about operation profits. Focus on project costs from initiation through handover.
B. Ensure maximum profits by buying the best and cheapest items, components and modules - potentially from a big number of different suppliers - and integrating them.
C. Create a realistic plan broken down to a sufficient level of detail. Perform all risk management processes. Ensure real-time communications with all stakeholders.
D. Try to get a second project manager assigned to share decision making and accountability to shareholders with the person.

george (11months ago):
I think it's C, because:

A: Yes, you're not responsible for lifecycle costing, but you're responsible for project success, which is jeopardized by incorrect estimate. After all, you will be responsible for not raising this problem to stakeholders.

B: Maybe (!) this is a good way to solve the problem, but first you should update the estimate. To make sure that project stakeholders know about the situation.

C: In other words you should start estimating process from scratch. And it's correct.

D: New person won't solve the problem with stakeholders. You just need to inform them through documents, not through in-formal communications.

What if project is calculated with very small margin during operations?