Just an observation - I found the question to be very good but what made it easier for me was that there is only one set of answers:
orDino flies
Dino eats
If the for loop run correctly (providing there was no issue of just one method in interface) it would print set of 4 lines each time.Bino flies
Bino eats
I would expect it to say as one answer:
This would make more sense in my opinion.Dino flies
Dino eats
Bino flies
Bino eats
Obviously it doesn't make the question wrong in any way, it just makes it easier to notice that most obious answers are incorrect almost straight away.
Still a good question and the whole app is excellent. Well done!