What is the outcome expected from executing a "retain" mission?

Executing a "retain" mission primarily focuses on maintaining control over a specific geographic area or territory. The goal is to reinforce and sustain a unit's presence in that area, which may be vital for operational success or strategic advantage. In a retain mission, forces are tasked with preventing the enemy from gaining access to or control over that territory, thereby ensuring that the mission objectives can be fulfilled without the disturbance of enemy influence.

This outcome is essential for a variety of reasons, including securing lines of communication, protecting civilian populations, and maintaining operational capability. A successful retain mission allows forces to operate effectively within that area and contributes to broader strategic objectives. While other missions might involve defeating the enemy or preventing the loss of terrain, the specific intent of a retain mission is to solidify control of designated geography, making option C the most appropriate choice.