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Question:

The postman came to the house. He has a letter for my mother. I heard the doorbell ring. I took the letter from the postman.
To improve sentence fluency, how could you state the information above in a single sentence?

A When I heard the doorbell ring, I took the letter for my mother from the postman who had come to the house.
Explaination

Sentence fluency is best achieved with clarity and a small number of clauses. Unlike the other options, (A) joins all four sentences into only two clauses. The other options have 3-4 clauses and are less succinct.