The company officer should request any ______ necessary before starting the lesson.

Requesting assistance before starting a lesson is crucial for ensuring that the instruction runs smoothly and effectively. This assistance can come in various forms, such as help from other instructors, additional resources, or technical support, all of which can enhance the learning experience. By obtaining the necessary assistance beforehand, the officer helps to create a conducive and well-organized environment, allowing for better focus on the lesson objectives without interruptions or complications that could arise from a lack of preparation or support.

Other options do not align as closely with the immediate needs that might arise before conducting a lesson. For example, justifications may pertain to the rationale behind the lesson but are not typically necessary for the execution of the lesson itself. Supervision might be relevant in certain contexts but isn't universally required before starting every lesson. Refreshments could enhance the learning environment in a less formal setting, but they are not essential to conduct teaching effectively. Thus, requesting assistance stands out as the most relevant and practical action to take prior to beginning the lesson.