As he sat and regained his breath, he noted that he was feeling quite warm and comfortable. He was not shivering, and it even seemed that a warm glow had come to his chest and trunk. Then the thought came to him that the frozen portions of his body must be extending, and he made another wild run along the trail. And all the time the dog ran with him, at his heels. What is the character’s motivation in the excerpt?

The man is internally motivated by his loyalty to the dog.
The man is internally motivated by a survival instinct.
The man is externally motivated by the hope of peer recognition.
The man is externally motivated by the urgings of the dog.