All i know is that Horace Mann made the educational system when he became Secretary of Education in Massachusetts in 1837, he set forth his vision for a system of professional teachers who would teach students an organized curriculum of basic content.
Answer:
The answer id probably A but without the Article I cannot be sure
Explanation:
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Carbonation? and Oxidation?
1) by making certain goods and services available
2) by creating advertisements
3) and by knowing what a consumers wants