GMAT Reading Comprehension (RC) | Re: GMAT Prep RC: Linda Kerber argued in the mid-1980’s

Well,
Because must be true question would not use the term "Suggest" . Suggest is use to ask about inference because
1) SUGGEST means some thing that "can be" derived at using the information which is essentially also the definition of "Inference" .
2) SUGGEST also means hidden conclusions or plausible but not explicitly mentioned secondary information that can be logically guestimated from the available info.

Based on these two criterion I finally think this
...

---