The correct answer is letter C. American Montessori Society. They do not give grant certifications. Child Welfare League of America, State Departments of Education and Association Montessori Internationale are organizations give grants.
Because he wanted the nation not to pick favorite I think and not to make alliances.
The correct answer would be the last option. The etymology associated with a dictionary entry has to do with a words origin. It is the history of a word and how its meaning and form changes as time goes on. It is how a word is derived.