I think that someone built the house in 1814.
Correct answer: B. I think that the house was built in 1814.
- A. I think that the house was built in 1814 by him.
- B. I think that the house was built in 1814.
- C. I think that the house built in 1814.
- D. I think that the house had been built in 1814.
Explanation
The original sentence is a statement about your belief or opinion, and the correct reported speech maintains the same meaning and tense. The focus is on the house being built, not on who built it (since that information is not certain).
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