Respuesta :
Since it says the dog was "presented" with the tray with the blue block, it sounds like it was the first time, so my answer would be the FIRST one: The dog moves the block because he wants the treat. If it's the first time, the dog hasn't yet learned anything and just sniffed out the treat.
Hope this helps! :)
Hope this helps! :)
C. The dog moves the block because he wants the treat.