The strange situation procedure, in which researchers unobtrusively watch an infant in the presence or absence of several combinations of the child, caretaker, and stranger, is used to study .

The answer is- Attachment

Explanation:

The Strange Situation Procedure is a procedure which was conceived in the 1970s by Mary Ainsworth in order to observe and test the response of babies and young children to the absence of their mothers. It observes the attachment relationships which the child would depict  when put in a different room with or without the presence of the caregiver.

Attachment is described as a deep and enduring two-way emotional bond between two individuals across time and space. Each individual depends on one another for their own emotional security.

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