I got A and then in blind review decided to go with D :

My thoughts were “this seems correct but I’m suspicious”

Same :(

This is a trick I picked up from one of the comments that is a good stepping stone :

If anyone is struggling with strengthen/weaken questions ( I, too, did up until recently), it really helps me to focus on the fact that the answer choices are supposed to be added premises for strengthen, and for weaken, it’s like being in a debate with someone. So for strengthen, I read the stimulus, making sure to read the conclusion last, and then say “And this is true/likely true because [AC candidate]”, which saying out loud will help you ID that it really is strengthening the argument (or not if wrong choice). For weaken, same thing except I say, “But this likely isn’t true considering that [AC candidate]”. Hope that helps!

I applaud you cause this just made it click even more in my head 👏

This was An a amazing explanation thx