LOL at C. I do all three, depending on how interesting the subject is to me.
A. if it's something that is mildly interesting that I know I won't bother looking into further on my own, but interesting enough that I'm still curious.
A. & B. if it's something that I'm genuinely interesting in personally.
C. if it's something uninteresting even after I look at it with an open mind, and I'll probably let them know what I think about it by talking shit about whatever it is and give reasons for it.
i am nosy and i dont hold back if there is some thing i dont understand i will ask about it and then also research to make sure the person telling me knew what they were talking about