Sentence Correction (SC) | Nineteenth-century doctors thought that alcohol, when ingested, passed

Nineteenth-century doctors thought that alcohol, when ingested, passed through the stomach into the bloodstream and was broken down only by the liver; recent studies, however,have led them to conclude that the stomach breaks down up to 20 percent of ingested alcohol before it reaches the liver.

[A] have led them to conclude
[B] have led to their conclusion
[C] have led doctors to conclude
[D] lead to doctors concluding
[E] lead to the doctors' conclusion

Taken from GMATPrep Paid Question Bank.
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