Final answer:
The best supporting detail for Jameson's claim is when Akela tells the pack that the law of the jungle will vanish if not followed, emphasizing Akela's teaching role on the importance of jungle law.
Step-by-step explanation:
The detail that best supports Jameson's claim that 'Akela teaches the importance of following jungle law' would be option D: he tells the pack that the law of the jungle is going to disappear if it is not obeyed. This detail explicitly shows Akela's understanding of the significance of the jungle law and his endeavors to communicate its importance to the pack. Akela emphasizes the consequences of not obeying the law, demonstrating his role as a teacher and the importance he places on jungle law.
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