Correct option is B
The correct way to ask everyone if the children were not reading the books in passive voice is
(b) Were the books not being read by the children?
Option (b), "Were the books not being read by the children?" correctly transforms the active sentence into a passive one while maintaining the negative aspect ("not reading").
The passive voice structure typically involves the form of the verb "to be" (were being) followed by a past participle (read), with the agent (the children) following the verb.
Other options:
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Option (a), "Were the books being read by the children?" is a passive construction but does not convey the negation ("not reading").
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Option (c), "Were the book not being read by the children?" is grammatically incorrect due to the singular "book" instead of the plural "books."
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Option (d), "Were the children reading the books?" is in the active voice, not the passive voice.