According to Lester (1974), the advent of separation anxiety is linked with:

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Lester (1974) argues that separation anxiety is linked with the development of a concept of objects, which emerges around 8-9 months of age. This is the point when the infant becomes aware that objects (including people) continue to exist even when they are out of sight. This realization leads to anxiety when caregivers leave, as the infant understands that they still exist but are not available, causing distress. The other options (A, B, C, E) may contribute to separation anxiety in some children, but they do not represent the underlying mechanism proposed by Lester (1974).

According to Lester (1974), the Advent of Separation Anxiety Is