Statistician: Two major studies found no causal link between medical procedure X and disorder Y, but these studies are flawed. One study looked at 1,000 people who had undergone procedure X and the other study looked at 1,100 people who had undergone procedure X. But because disorder Y occurs in only .02 percent of the population, researchers would need to include many more than 1,100 people in a study to detect even a doubling of the rate of disorder Y.

Question: Which one of the following most accurately expresses the main conclusion of the statistician's argument?
Options:
A. Contrary to the findings of two major studies, there is reason to think that procedure X causes disorder Y.
B. Two studies that discovered no causal link between procedure X and disorder Y are unsound.
C. Researchers should conduct more-extensive studies of procedure X to determine whether the procedure is causally linked with disorder Y.
D. The two studies cited did not reach a conclusion as to whether disorder Y results from procedure X.
E. Despite the opinions of many medical experts, it has not been established that there is a causal link between procedure X and disorder Y.
Answer: "B"