Not sure if this helps but,

I eliminated B because it said "many", not "All". I don't really know anything if some products fail whether they're supported or not. Maybe the companies does maybe it doesn't. The fact that others failed but some succeeded doesn't really affect the arguments strength IMO.

D Strengthens the argument by saying how the tools are more accurate. If the tools are extremely accurate, it's less likely that they made an error and that the conclusion is correct. If D had said "the tools are almost always wrong when measuring anxiety and depression" it would be more correct as that would weaken the argument.

The question stem asked what did NOT strengthen the argument. I ruled out C because it introduced the 40-60 year olds while the question stimulus talks about first year students. It doesn't strengthen the argument because it's a) talking about a different group of people without making a clear connection.

I did the exact same thing. I thought that Main street and walnut HAD To be the same location and pushed members up into the domain. I hunted for that answer choice as well, and then picked B.

/