4 Select the correct answer.
According to Piaget's theory of cognitive development, which stage is over by the end of the first two years of a child's life?
OA. preoperational stage
ОВ.
concrete operational stage
Ос.
formal operational stage
OD
sensorimotor stage
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OD --sensorimotor stage

Explanation: There are four stages According to Piaget's theory of cognitive development which are  Sensorimotor, Preoperational, Symbolic thought  and Concrete operational.

The sensorimotor stage  is the first stage of a child's development which starts at birth till age 2. This stage is characterized  with the child acquiring knowledge by physical activities with his or her environment  which develops to developing  fine motor skills and the ability to use symbols to create  mental representations   toward end of the stage.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.