The correct option for the sentence is 'will have taken off.' It represents the future perfect tense.
The plane will have taken off in two hours.
In this sentence, the correct option is (a) will have taken off as it represents the future perfect tense. The future perfect tense is used to indicate an action that will be completed before a specific time in the future.
For example, 'By the time we arrive at the airport, the plane will have taken off.' This shows that the plane's action of taking off will be completed before a specific point in the future, which is when 'we arrive at the airport.'
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