The best and the most correct answer among the choices provided by the question is the first choice. The denotation for proponent is "supporters" I hope my answer has come to your help. God bless and have a nice day ahead!
John Thornton and Buck's connection goes far beyond the working relationship that Buck had with Francois and Perrault. He respected those men for their understanding of dogs and of nature, but he had no great affection for them. John Thornton is "the ideal master," for he understands Buck without difficulty or confusion. Buck loves him because he shows his need for Buck, repeatedly demonstrating that Buck can help him in ways that others can't.
