According to the PMBOK Guide, 6th edition, section 11.6.1.1, the project manager is responsible for monitoring and controlling the project risks and ensuring that the project objectives are met. The project manager should also identify and analyze any new or emerging risks that may affect the project performance or scope. In this scenario, the project manager should first work with the team and others in the network to assess and prioritize the obstacles. This will help to determine the impact and probability of each obstacle and decide on the best course of action to address them. The other options are either premature or inappropriate, as they do not address the root cause of the problem or respect the authority and responsibility of the project manager. References: PMBOK Guide, 6th edition, section 11.6.1.1, page 442.