Final answer:
The most common attachment style across cultures is secure attachment, where children use their caregiver as a secure base to explore and seek comfort in times of stress.
Step-by-step explanation:
The most common attachment style across cultures is secure attachment. Children who exhibit secure attachment use their caregiver as a secure base from which to explore their environment. These children tend to prefer their parents over strangers and seek comfort from them in times of stress. Ainsworth's research on attachment styles, including secure, avoidant, resistant, and disorganized, helps us to understand the different ways children bond with their caregivers, with secure attachment being the most beneficial and prevalent.