The project manager's next step should be to address the conflict through stakeholder engagement and contract
/rights clarification. Reviewing the agreement with the property owner and meeting to discuss concerns (D) is the most appropriate immediate action because it seeks resolution at the source, confirms legal/contractual obligations (easements, access rights, notice requirements), and explores mutually acceptable solutions (schedule adjustments, access conditions, compensation processes where applicable). Informing the client maintains transparency and enables coordinated decision-making. Immediately attempting to "force" collaboration via dispute (A) escalates conflict and can increase delays, legal risk, and reputational damage.
Rerouting the pipeline (B) is a major scope/schedule/cost change and should not be executed unilaterally; it likely requires approvals and may introduce permitting and engineering impacts. Escalating to the CCB and
"waiting" (C) is too passive in the face of an active blocker; escalation may be needed, but the project manager should first attempt direct resolution and clarify rights. This approach increases the chance of timely cooperation while protecting contractual and stakeholder relationships.