I'll answer C). First, I think there's such a range in severity because what severity is or means truly is a broad term. It can mean something different to clinicians and to people who stutter (we actually have a survey on this right now if you'd like to participate!). So, there's a range because I think the term is broad. Also, people use it to indicate both severity of stuttered speech behavior (disfluency) or how much they are adversely impacted (the lived experience). This adds to the range people report and furthers the confusion. Lastly, I think clinicians and researchers drastically underestimate how much variability people who stutter experience. Dr. Yaruss actually just started a large-scale study (funded by the NIH) trying to quantify how much variability people who stutter experience. He thinks (And I agree) that stuttering will vary MUCH more than clinicians currently think it does