I would say answer (B).
I believe in most operations (B) would be appropriate, however, depending on the checklist being carried out it might be mandatory that during that checklist both PNF and PF confirm the position of the lever/switch or setting.
If I was the PNF I would automatically be checking the lever/switch after I read it out loud. I couldn't see myself staring at the checklist and not looking. So in that case I'd actually be doing (C).