Answer and explanation

Correct answer: B. redecorated

  1. Step 1: 'Have + object + past participle' expresses arranging for someone else to do a job.
Answer
redecorated.
Why not the others: "to redecorate" is wrong because the infinitive does not follow this causative structure. "redecorate" is wrong because 'have something done' needs the past participle. "redecorating" is wrong because the -ing form would suggest the room is doing the work.

Practise more Passives, gerunds, infinitives and modals.

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