Final answer:
The infants who show more apprehension and are less inclined to explore independently display characteristics of an insecurely attached style, specifically resistant attachment.
Step-by-step explanation:
The infants described in the question show more apprehension and fewer tendencies to leave their mothers' sides to explore, which is indicative of an insecurely attached style. According to Mary Ainsworth's attachment theory, secure attachment is characterized by children who are distressed when separated from caregivers but feel happy when the caregiver returns, using them as a secure base for exploration. In contrast, insecurely attached children, particularly those with resistant attachment, tend to show clingy behavior and are less likely to explore their surroundings, becoming extremely disturbed during separation and difficult to comfort upon reunion.