Infants in this sensorimotor substage learn to repeat bodily movements that occurred initially by chance; they then repeat this chance behavior intentionally. substage 1: simple reflexes substage 2: first habits and primary circular reactions substage 3: secondary circular reactions substage 4: coordination of secondary schemes

2: first habits and primary circular reactions sub-stage                            

Explanation:

A primary circular reaction is described as one of the sub-stages involved in the sensorimotor stage which is considered as an important stage in the cognitive development theory and was introduced by Jean Piaget. A primary circular reactions stage starts from one month of the infants' life and lasts through four months of age. At this stage, an infant tries to re-create or reproduce a particular event that has happened via accident, for example, thumb sucking. An infant tends to coordinate new schemas and sensation.

The correct option is 2, in the question above.

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