A17-month-old child would be expected to be in what stage, according to piaget?

Tertiary circular reactions  stage

A 17-month-old child would be expected to be in tertiary circular reactions stage, according to Piaget.  

Tertiary circular reactions stage is a sub stage under the sensorimotor stage which is the first of the four stages in Piaget's theory of cognitive development. Tertiary circular reactions stage is a phase of fast cognitive growth which extends from 12months to 18 months. During this stage, children experiences a time of trial and error by using their actions and senses.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.