I've reported the audio not working. This has happened a lot recently, particularly in this section. Edit: also discussion points I add are not appearing immediately, and in some exercises in this section the discussion is not available. I do not know where else to report it.
In Polish "dla niej" means "for her" "dla niego" means "for him", thus intuitively I would translate"Pro něj?" as "for her" not "for him", however there is no option for "her". I reluctantly picked up "for him", which was accepted, however I feel that there is some mix-up here.
No, there's no mix-up with the exercise. I'm guessing that you're talking about a word bank exercise.
There is no option for "her" because pro něj does not mean "for her." That would be pro ni.
But if there had been an option for "her," and you had selected it, your answer would have been incorrect. (If I have misunderstood your comment, please try again. )