The sentence talks about a possibility in the past. The phrase 'may/might (not) + have' is used to express possibility/desirability relating to the past action. The highlighted part of the sentence is incorrect as 'may/might (not) be' refers to the present and/or future. Similarly, options (a) and (c) are incorrect. Options (b) and (d) use past tense. The verb should be passive as the action is done on the subject 'file'. As per this, the phrase in option (d) is incorrect as it is in active voice.
Among the given options, the phrase in option (b) is the correct choice.
Hence, option (b) is the correct answer.
Note:
Voice of a sentence - Depending upon the emphasis we want to lay we use a particular voice in a particular context. We use active voice to lay emphasis on the doer of the action while we use passive voice to lay emphasis on the receiver of the action.
Example:
Active- Radha will work. (emphasis on Radha)
Passive- Work will be done by Radha. (emphasis on Work)
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