I picked A. Correct answer B. I don't see how the current groups give enough info to draw a conclusion.
JY states that the group of "people rely on the web when attempting to diagnose medical conditions" falls in to the group of "people who browse the web for medical information". True. But I don't think this matters?
We need to make an appeal that the first group, the people who rely on the web, will be fooled by the quackery. It's possible that the only people that group of people rely on the web only contains people with a medical background, as well as, people who can always discriminate between scientific valid theory and quackery, in which case, B doesn't assist at all in proving the conclusion because they are relying exclusively on scientifically valid information.
I see another necessary assumption being something that needs to eliminate this subgroup, and make it not possible to exist.
A was the best choice from here.
Follow up - does "typically" have a definition on the LSAT?
Admin Note: https://classic.7sage.com/lsat_explanations/lsat-63-section-3-question-11/
Interested. PM me.