Respuesta :
I believe that the answer would be the first one with the hawk. They have learned from previous experience not to trust the hawk because it could kill them. I am unsure about this, because the second looked like it might work, too. The others do not seem like correct answers to me.
tl;dr - For gradpoint it's B.
If the bird found a food source in the feeder several times, it has learned that it can survive off of it. Therefore it returns to the feeder.
Hope this helps~