Because A, C, and D are response decisions, and the project manager does not yet have a completed risk assessment.
A. Escalate to the sponsor and request a delay in go-live is premature. Escalation is appropriate when the issue exceeds the project manager’s authority or when analysis shows the risk materially threatens objectives. Here, the first responsibility is to document the threats and evaluate their probability and impact before asking for a schedule decision.
C. Replace the vendor immediately is too drastic as a first move. The vendor has warned of a possible resource constraint for the next sprint, but that does not automatically justify replacement. The project manager should first assess the risk, confirm the extent of the impact, and consider response options such as reprioritization, negotiation, contingency planning, or escalation.
D. Remove the affected region from the rollout scope is also premature because it changes scope without analysis. Scope reduction can be a response strategy, but only after understanding how serious the integration issue is, whether it is temporary, and what other responses are available.
So B is first because PMI risk practice follows the sequence: identify the threats, record them, assess probability and impact, prioritize them, and then decide on the response.
