True, the correct answer is A. Thanks! From these bullet points we see that Buck is content with his life and he has a great love for his master Thornton, which is evident by the fact that he was able to pull the sled and the he enjoys time they spend together. But there is also that call of the wild with calls to Buck, his instincts always there that pull him to the wilderness.
<span>The most clear conclusion that can be drawn from these ideas is </span>As content as Buck is with the life he is leading with Thornton, it is impossible for him to ignore his own natural instincts. So the answer to your question would be letter A.
