If we're going to be consistent with other rulings - generally, if the batter interferes with a potential play, we have an out; but if the batter "interferes" while there is NO potential play, and a play develops because of that "interference", it's just a dead ball - put the runner back.
(B) is nothing.
(A) is - if no play, B/R to first, runner back; if there is a play, B/R out, runner back.