The question for B might then become, under which scenario is some sort of biogenesis more likely, one in which a papperclipper exists, or one in which it doesn't? The former includes the paperclipper itself as potential fodder for evolution, but (as was just pointed out) there's a chance the paperclipper might work to prevent it; while the latter has it for neither fodder nor interference, leaving things to natural processes.

At what point in biogenesis/evolution/etc do you think the Great Filter does its filtering?