Step 1: Understand the sentence structure.
The sentence provides additional information about the sale of the painting and must be clear and grammatically correct. The correct choice should smoothly integrate this information.
Step 2: Analysis of options.
- (A) Thames sold for £18.5 million and it was: This sentence is missing important context and is grammatically incorrect.
- (B) Thames, which sold for £18.5 million, was: Correct. This sentence provides clear and accurate information with proper use of commas and is grammatically sound.
- (C) Thames, was sold for £18.5 million: This option is incorrect due to awkward phrasing and punctuation.
- (D) Thames sold for £18.5 million, being: "Being" creates confusion and disrupts the sentence’s clarity.
- (E) Thames, sold for £18.5 million, and was: This option contains unnecessary punctuation and a redundant conjunction.
Step 3: Conclusion.
The correct answer is (B) because it provides clear, grammatically correct information in a well-structured sentence.