Correct option is B
Option (b) contains an error.
· The error in the segment "When Nisha will" is due to the incorrect placement of "will" with the conjunction "when" in a question format. In English, when forming questions about the future, especially with "when," the auxiliary verb "will" typically follow the subject, not precedes it.
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Grammatical rule used: In question structures involving "when" for future events, the correct syntax in English is to place the subject before the modal verb (will). The error occurs from using "will" before the subject, which is not standard English practice.
· Correctly phrased, it should be "When will Nisha have finished her task?"