Are you suggesting, then, that the answer is C? I would hypothesize A is more likely, even assuming intelligence is genetic. Thus, my only point was there's a c

Are you suggesting, then, that the answer is C? I would hypothesize A is more likely, even assuming intelligence is genetic. Thus, my only point was there's a confounding variable if we try to use the relative tested levels of intelligence between parents an children as a basis to say whether intelligence is genetic. That's not to say there aren't potentially ways around that by designing studies carefully.