John stayed _____ after school to take the test.
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behind
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beyond
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back
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none of the above
'Behind' (A) is the correct preposition here. 'Stay behind' is a standard phrasal verb meaning to remain after others have left or after a scheduled departure time. In school context, 'staying behind' means remaining after dismissal. 'Beyond' means further away than something, 'back' suggests returning, neither fits this context.
'Stayed behind' is the correct idiomatic phrasal verb meaning to remain in a place after others have left, which fits the context of staying after school ended to take a test. 'Beyond' doesn't collocate with 'stay' in this sense (it means 'past a point'), and 'stayed back' (not 'back' alone) would be the alternative correct idiom, but 'back' alone is not standard usage here. 'None of the above' is wrong since 'behind' fits correctly.