The answer is cultural diffusion.
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Before the end of WWII in 1945 most of European countries were in constant wars with their neighbors. This was detrimental for the entire region because the fighting hampered efforts to develop a sustained economic growth. Due to these circumstances, the European Union was born to finally put an end to the endless wars among countries.
Around the 1950s, countries which were producing coal and steel in Europe, decided that in order to continue with the success of the two industries, it was necessary to unite European countries. Thanks to their efforts, the European Union was born.
The founder member countries were Italy, Belgium, France, Germany, Luxembourg and the Netherlands. They have been very successful in creating of the largest economic trading blocks around the world. It is their hope that the success continue for many decades to come.
Okay. Montessori schools have to do with the children being creative with their learning, while the teacher helps them with giving them activities that suit them. It does not put children at risk for poor study habits or produce children who have little confidence in their academic abilities. B and D are eliminated. It does not emphasize social over academic achievement. Both are just as important. It can help observe the child's behavior and use materials to see what they are like over the years. The answer is C.
It helps us understand how this world became the way it is over time.