What is a disadvantage of using spontaneous media during a lesson?

Using spontaneous media during a lesson can indeed pose the disadvantage of requiring the instructor to frequently turn back to the class, which can disrupt the flow of teaching and diminish the instructor's engagement with students. When spontaneous media is used—such as videos or real-time demonstrations—it can easily pull the instructor's focus away from the class, as they might need to operate the media or adjust the setup. This can create a barrier to maintaining a connection with the students, as the instructor's back is often turned, limiting their ability to read student reactions or support participation effectively. The resulting lack of direct engagement might lead to reduced attentiveness or interaction from the students, as they may feel disconnected from the instructor during these moments.

In contrast, the other options could be positive or neutral aspects of teaching. Extensive use of multimedia often enhances a lesson's appeal, while encouraging lengthy discussions and promoting group activities are generally beneficial to learning outcomes. Therefore, while spontaneous media can have advantages, the need for the instructor to turn away from the class stands out as a notable disadvantage.