Reports Have Shown That What Used to Be Considered "No

Reports have shown that what used to be considered "no stuttering" Native American groups do, in fact, exhibit the problem of stuttering and even have several words to label it it. These findings:

A) indicate that culture has absolutely no effect on stuttering
B) clearly prove that stuttering was introduced into these groups only recently
C) support the idea that stuttering is universal
D) proves that once there is a word for it, stuttering will occur in members of the group