Final answer:
The correct translation is 'Le chat est derrière le fauteuil' which means 'The cat is behind the armchair'.
Step-by-step explanation:
The correct translation of the sentence "The cat is behind the armchair" is Le chat est derrière le fauteuil. The preposition "derrière" means "behind" in English. It is used to indicate the position of an object which is located at the back or rear of another object. In this case, the cat is positioned behind the armchair.
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