According to the Textbook,which One of the Following Conclusions Is

According to the textbook,which one of the following conclusions is most justified based on the research on brain development?

A) It is essential that children begin studying basic math and science before they reach the age of 7.
B) Classroom experiences can significantly enhance students' cognitive development throughout the elementary and secondary school years.
C) The ability to think abstractly depends on the development of many synaptic connections during the first five years of life.
D) Children probably won't acquire important motor skills (such as using a pencil or cutting with scissors) unless they begin developing those skills before or during the early elementary grades.