SAT English Practice Question

The scientists presented their findings in a series of reports, each one meticulously detailed. The reports explained the methods they used, the data they gathered, and the conclusions they reached. It was important that the reports were easy to read and understand, for they were intended for a broad audience. They needed to be both clear and concise. Which of the following sentences is written most clearly and concisely?

1. A.They presented their findings in a series of reports, each one meticulously detailed, which explained the methods they used, the data they gathered, and the conclusions they reached.
2. B.They presented their findings in a series of reports, each one meticulously detailed, and explained the methods they used, the data they gathered, and the conclusions they reached.
3. C.Each of the reports they presented meticulously detailed the methods they used, the data they gathered, and the conclusions they reached.
4. D.The scientists presented their findings in a series of meticulously detailed reports, explaining the methods they used, the data they gathered, and the conclusions they reached.