Answer:he is the one from whom the message was intended
Explanation:
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.
The most likely definition for 'derivative' as used in the above context is 'INVENTIVE'. To be inventive means having the ability to create or design new things or the capacity to think original thoughts. From the passage given, the writer used the word 'derivative' to mean that some people can create new, original things or ideas which people around them may not understand at all.
A.is
B.was
C.are
D.is
E. were
F. was