The correct option is A Application-based learning is used by us.
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The correct answer is ‘Application-based learning is used by us.’ In the given sentence, the focus is on the doer, ‘we’ because the doer is actively performing the action on ‘the receiver’, application-based learning. When we change the sentence into passive voice, the focus shifts from ‘the doer’ of the action to ‘the receiver’ of the action, that is, ‘application-based learning.’