Marty's dog always sits when Marty opens the cupboard to get the dog a biscuit. How would a behaviorist describe the dog's behavior? A) The dog thinks that, if he sits, he will get a biscuit. B) The dog is hungry, so his instincts tell him to sit. C) The dog expects to get a biscuit when Marty opens the cupboard. D) The dog sits when Marty opens the cupboard.