Buck had been purposely placed between Dave and Sol-leks so that he might receive instruction. Apt scholar that he was, they were equally apt teachers, never allowing him to linger long in error, and enforcing their teaching with their sharp teeth. Dave was fair and very wise. He never nipped Buck without cause, and he never failed to nip him when he stood in need of it. As Francois's whip backed him up, Buck found it to be cheaper to mend his ways than to retaliate. Once, during a brief halt, when he got tangled in the traces and delayed the start, both Dave and Sol-leks flew at him and administered a sound trouncing. The resulting tangle was even worse, but Buck took good care to keep the traces clear thereafter; and ere the day was done, so well had he mastered his work, his mates about ceased nagging him. Francois's whip snapped less frequently, and Perrault even honored Buck by lifting up his feet and carefully examining them.

How does Buck’s behavior support the theme "one must lead with a firm hand”?
A. Buck learns quickly because Dave never nips without cause.
B. Buck becomes a leader because other dogs respect his authority.
C. Buck learns quickly because his teachers are strict and unforgiving.
D. Buck excels because he remembers the man with the red sweater.

1. B

2. A
3. D
4. D
5. C (this question)
6. B

The correct answer is option C. Buck learns quickly because his teachers, Dave and Sol-leks, are strict and unforgiving. In the given passage, it states that Dave is fair and wise, never nipping Buck without cause, but also never failing to nip him when he stands in need of it. This strict and consistent discipline helps Buck quickly understand his mistakes and learn to correct them. This supports the theme "one must lead with a firm hand" because Buck's progress and improvement are a direct result of the firm and disciplined teaching he receives from Dave and Sol-leks.