In piaget's theory, the stage of development between birth and 2 years of age, in which the individual uses senses and motor abilities to interact with objects in the environment, is called the stage.

Sensorimotor stage

Explanation:

 In the Piaget theory, the sensorimotor stage is basically proposed by the jean Piaget in which it described about the development of child, infant  and the adolescent.

It is one of the type of cognitive development in which the it describe about the earliest stage of the child birth between to the birth of the child to the 2 years age.

In this stage, the child life stage are basically characterized by the child sensory and the person uses the senses and its abilities for interaction in the physical environment.

there is an explationation of this on a site called crash   course world history 1

answer; (b) ; /stronger bonds between the nations of africa