Which of the following laws of learning emphasizes the importance of a learner's readiness to learn?

The concept of learner readiness aligns most closely with the principle of recency. This law of learning suggests that individuals are more likely to retain information that they have encountered recently and are prepared to engage with. In the context of readiness, it implies that learners who are motivated and in a state of readiness to absorb new information are more likely to learn effectively. When learners are prepared and have a keen interest in the subject matter, they are more engaged, which enhances their learning experience and outcomes.

When considering the other principles, while they contribute to the overall learning process, they do not specifically focus on the learner's readiness. The effect emphasizes the positive outcomes of learning from experiences, exercise focuses on the necessity of practice to reinforce learning, and primacy relates to the idea that information learned first is often retained better. Each of these plays a role in the learning process, but none highlight readiness as directly as recency does, which is why it is the most appropriate answer in this context.