On Dora's First Birthday,one of Her Aunts Brought a Set

On Dora's first birthday,one of her aunts brought a set of Lego basic bricks that she absolutely loves.Dora spends hours building,breaking,and rebuilding towers from the bricks and smiles widely whenever she discovers something new she can do with them.Dora's preoccupation with manipulating the building bricks in different ways reflects a function of the sensorimotor substage of

A) secondary circular reactions.
B) tertiary circular reactions,novelty,and curiosity.
C) first habits and primary circular reactions.
D) simple reflexes.