You are finishing the prototype

You are finishing the prototype that was planned as a risk mitigation strategy
when you found out that the Benefit Cost Ratio (BCR) has been improved and the project
Cost Performance Index (CPI) is 1.03. The standard deviation of the project time estimate
has decreased and you discover that the prototype, already almost finished can fulfill the
needs of other project requirements as well. What should you do FIRST?
a) Look for ways to help get the prototype accepted faster and then cut cost
b) Review the benefits of the project with the customer and determine if the prototype
will improve the benefits
c) Compress the project to get it completed faster using the prototype
d) Look for the risk impacts of fulfilling other requirements with the prototype.

Option : D

Why D? Why NOT B?