When working with external providers, especially in multinational or multilingual environments, establishing a common set of terms and communication language is essential for clarity, reducing misunderstandings, and increasing success in delivery.

Per the PMBOK® Guide – Seventh Edition, the Communication and Stakeholder Performance Domains emphasize mutual understanding and clear language, especially in procurement relationships.

Option A is supportive but not the first step.

Option B misplaces responsibility—project sponsor is not the communication lead.

Option C is general and doesn’t address the specific provider issue.