Concept:EVS learning follows the natural cognitive development of children, starting from basic ideas and gradually moving to more advanced ones.Explanation:Young children cannot understand complex or abstract concepts directly. So the EVS curriculum is designed from simple topics first. These simple topics act as a strong foundation. As children move to higher grades, their ability to grasp complex ideas improves. Each new topic builds on previously learned simple topics. This step-by-step approach boosts confidence and makes learning easier. Other principles like complex to simple, global to local, or abstract to concrete are not suitable because they would confuse children in their early learning stages. Therefore, the principle of "simple to complex" is the correct guiding principle for EVS learning.Answer:Option A (simple to complex).