Select the option with the correct use of future tense.

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The correct sentence uses the future perfect tense to indicate an action that will be completed by a certain future time. The structure is 'will have' + past participle. Option 4 correctly uses 'will have completed' to express that by next December, the action of completing six years in the home will be finished. Other options are grammatically incorrect: Option 1 incorrectly uses 'will have been completed' (passive form not suitable here), Option 2 uses 'will be completed' which is passive and incorrect in this context, and Option 3 uses 'will have complete' which is grammatically wrong as the past participle form 'completed' is needed.

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