Which is an example of how old yeller loves travis unconditionally?

a.
when old yeller is injured but walks all the way home to get for travis

b.
when old yeller risks his life to save travis from a fox with hydrophobia

c.
when old yeller is seriously injured but licks the wound travis has on his leg

d.
when old yeller attacks a bear that has grabbed travis by the ankle

I would say C. It is different from the other answers because they involve saving Travis's life in some way, which dogs are rather "programmed" to do for their owners already. When Old Yeller licks the wound on Travis's leg, he is not doing this to save Travis's life. He is doing this because he cares for Travis, and he cares so much that he ignores his own wounds and tries to tend to Travis's wounds. I hope this helps. :)