Final answer:
A child with a secure base will explore independently but seek comfort from their caregiver when needed, showcasing a secure attachment style developed through consistent and sensitive care from the caregiver.
Therefore, Option D is correct.
Step-by-step explanation:
A child whose caregiver serves as a secure base is likely to explore the environment independently, but always return to the caregiver for comfort. This behavior is indicative of a secure attachment style, where the child feels confident to explore knowing that they can rely on their caregiver to be available and responsive when needed. This attachment style forms when caregivers consistently meet their child's needs, allowing the child to see the world as a safe and predictable place.