Which of the following issues can arise from inadequate communication managed by a COR?

Inadequate communication managed by a Contracting Officer Representative (COR) can lead to challenges in issue resolution. Effective communication is vital in ensuring that all stakeholders, including contractors, fully understand the requirements, expectations, and any changes to the project's scope. When communication is lacking, misunderstandings can occur, leading to disputes or conflicts that may not be resolved promptly or effectively. This can result in delays, increased costs, or even project failure.

On the other hand, the option regarding enhanced contractor loyalty or aligned project goals typically stems from strong communication practices, where expectations and objectives are clearly outlined. Increased contract efficiency generally also relies on effective communication, as it ensures that resources are utilized effectively and any issues are addressed as they arise. Therefore, failing to manage communication appropriately can directly create obstacles in resolving issues, making this the correct choice.