What aspect related to adult education principles indicates that learning should occur at the right time?

The principle of immediate application emphasizes that learning tends to be most effective when it is relevant and can be applied right away to real-life situations. This principle aligns with the idea that adults are often motivated to learn when they see a clear connection between what they are learning and their immediate needs or challenges. Therefore, if learning occurs at the right time, it means that the information or skills being taught can be immediately utilized, resulting in increased retention and application of knowledge. This aspect acknowledges that adult learners seek practical benefits from their education and prefer to engage with material that they can apply soon after learning it.

In contrast, the other choices do not encapsulate this timely relevance in the same way. Spontaneity in learning does not guarantee that the knowledge is applicable when needed. Scheduling may imply a set timeframe that does not necessarily align with an adult's immediate learning needs. Exclusivity in learning does not foster an environment where timely lessons can be realized and may hinder the sharing of relevant knowledge among peers.