Final answer:
Rosa's behavior of being distressed when her mother left and happily seeking her out upon return demonstrates a pattern of secure attachment.
Step-by-step explanation:
The pattern of attachment that Rosa is exhibiting is secure attachment. When Rosa's mother left, she cried, indicating distress in the caregiver's absence. Upon the mother's return, Rosa immediately ran over to her, showing happiness and seeking comfort, which is characteristic of securely attached children. These children view their caregivers as a secure base from which they can explore the world and to which they can return for comfort in times of stress.