The answer is D, because it is a known fact that is it mandatory for children to go to school.
Well it isn’t C. Or D.
For a lil bit I was tied between A. And B.
But I figured out it is A.
Hope that I could help you
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The answer is D.
"Keep", "factor", and "calculate" are all verbs in the list of things the new system allows teachers to do. The other sentences are inconsistent with their list of verbs/adjectives/nouns. Thus, option D is the only one that is grammatically correct.
I am not too good at explaining, so let me know if you are still confused.
Hope this helps! :)
1. Puppy = Direct Object
2. Alaskan Husky = Predicate Nominative
3. Her = Indirect Object
4. White = Predicate Adjective