While preparing technical documentation in an engineering project, you realized that the construction effort was underestimated. After further analysis, you concluded that the approved scheduled cannot be met without redefining the project. As project manager, how should you proceed?

A. Discuss the issue and alternative solutions with the sponsor.

B. Eliminate scope components that were required by your organization but were not required by the customer.

C. Request additional funding from the sponsor to compress the schedule.

D. Review the project schedule, document the issue in a status report, and gather lessons learned regarding the schedule variance.