The peon will have to ring the bell.

Correct option is B

This is a question on changing an active-voice sentence into passive voice. In passive voice, the object (“the bell”) comes first, and “will have to be rung” expresses the necessity in the future, matching the structure of the original sentence.
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Information Booster

The "will have to be" structure is used to talk about necessity or obligation in the future in passive voice.

Questions like this are common in grammar assessments and serve to test understanding of tense, modality, and voice.
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Additional Knowledge

Other options use incorrect tense (present perfect, simple future) or meaning, and do not maintain the intended passive construction.