Securely attached children comprised the majority of the sample in Ainsworth’s (1971, 1978) studies. 

  Such children feel confident that the attachment figure will be available to meet their needs. They use the attachment figure as a safe base to explore the environment and seek the attachment figure in times of distress (Main, & Cassidy, 1988).

A: Insecure Avoidant

Insecure avoidant children do not orientate to their attachment figure while investigating the environment. 

 They are very independent of the attachment figure both physically and emotionally (Behrens, Hesse, & Main, 2007). 

They do not seek contact with the attachment figure when distressed. Such children are likely to have a caregiver who is insensitive and rejecting of their needs (Ainsworth, 1979).

C: Insecure Ambivalent / Resistant

The third attachment style identified by Ainsworth (1970) was insecure ambivalent (also called insecure resistant). 

Here children adopt an ambivalent behavioral style towards the attachment figure. The child will commonly exhibit clingy and dependent behavior, but will be rejecting of the attachment figure when they engage in interaction. 

The child fails to develop any feelings of security from the attachment figure.

sourced from simplypsychology.org