Step 1: Understanding the Concept:
Cognitive development in the preschool years (Piaget's preoperational stage) involves emerging logical reasoning, including basic understandings of functional relationships and sequences.
Step 2: Detailed Explanation:
- When the child states, "Run fast! We will reach park earlier," she is linking a specific action ("running fast") directly to a predictable outcome ("reaching the park sooner").
- This demonstrates a clear understanding of cause and effect (where running faster is the cause that reduces the time needed to travel, which is the effect).
- This statement does not involve pretend play (imagination), sorting objects into categories (classification), or systematically testing a scientific hypothesis (experimentation).
Step 3: Final Answer
Thus, the child is demonstrating an understanding of cause and effect (B only).