Answer :
Final answer:
The corrected sentence should be: 'This door will remain unlocked when the office is occupied.' This version respects the original meaning and is grammatically correct.
Explanation:
The sentence 'This door to remain unlocked when occupied.' is incorrectly formed because it lacks a main verb. A corrected version of this sentence depends on the intended meaning. Among the provided options, the most grammatically correct sentence that respects the meaning of the original is: 'This door will remain unlocked when the office is occupied.' In this version, 'will remain' acts as the main verb, 'door' is the subject, and the full sentence is a complete thought (which is an essential element of a correct English sentence).
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