Concept:Learning is an active process because learners construct knowledge through their own actions and interactions with the environment, not by passively receiving information.Explanation:Learning requires active engagement with experiences. Learners do not just memorize; they solve problems, reflect, and discover truths on their own. This hands-on approach leads to meaningful and lasting change in behavior. Passive acceptance of facts does not qualify as true learning. Instead, the learner must act upon the material—experimenting, questioning, and reconstructing ideas—to build understanding. Therefore, the active nature of learning lies in the learner’s role as a constructor of knowledge through direct experience.Answer:Option C: knowledge is constructed by the learner by acting upon it.