Liam is nine months old and beginning to scoot around on the carpet. His two favorite toys, a baby giraffe and a stacking ring, are on the carpet with him. Liam pushes away the baby giraffe to reach for the stacking ring. In his cognitive development Liam is in the ________ stage of cognitive development.
◦ reflective action
◦ coordination of secondary schemes
◦ primary circular reactions
◦ secondary circular reactions