Step 1: Understanding the Concept:
Jean Piaget divided the sensorimotor stage of cognitive development (from birth to 2 years) into six distinct substages, marking the transition from simple reflexes to symbolic thought.
Step 2: Detailed Explanation:
- Substage 6 is called Mental Representation or Internalization of Schemes (occurring from 18 to 24 months).
- During this final sensorimotor substage, toddlers develop the ability to use internal mental symbols (representations) to think about objects and actions.
- This cognitive shift is characterized by:
1. Solving problems through symbolic means: Toddlers can think through a problem internally to find a solution, rather than relying on physical trial-and-error (which is characteristic of Substage 5). Hence, (A) is correct.
2. Deferred imitation and make-believe/pretend play: Toddlers can mentally represent events and act them out later, initiating pretend play. Hence, (D) is correct.
- Standard physical trial-and-error (B) and basic sensorimotor cause-and-effect (C) emerge in earlier substages.
Step 3: Final Answer
The characteristics that first appear in the sixth sensorimotor substage are (A) and (D). The correct option is (B).