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B
couldn't
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C
shouldn't
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D
mustn't
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Solution
The correct option is B needn't The auxiliary "need", denoting necessity or obligation, can be conjugated with or without 'do'. When conjugated without 'do', it has no -s and -ed forms and is used with an infinitive without 'to' only in negative and interrogative sentences and in sentences that contain semi- negative words like 'scarcely' or ' hardly'.
(A) needn't - suggests that it is not necessary to pack a gas stove.