In sentence 8 (reproduced below), the writer wants to limit the scope of the claim expressed in the sentence so that it is consistent with the main argument of the passage.
The problem with most probiotic supplements is that no significant clinical trials have proven that they offer demonstrable benefits to
the general public.
Which of the following changes to sentence 8 best accomplishes this goal?
Changing "problem" to "issue"
Adding "clearly" before "significant"
Changing "proven that they" to "been confirmed to
Adding "that can be observed clearly after "benefits"
Changing "the general public" to "people without gastrointestinal disorders"