The practice of storytelling for entertainment and instruction was at one time so widespread that it virtually became . ......

The selected answer, universal, is correct because it accurately describes the extent to which storytelling was practiced. Here's why:

    
• Universal means something that is found everywhere or done by everyone.
    
• In the context of storytelling, it suggests that this practice was widespread across different cultures and societies.
    
• The question highlights that storytelling was not just a local or occasional activity, but rather a fundamental part of human experience.

In contrast, the other options:

    
• Rigorous implies strictness or thoroughness, which does not fit the context.
    
• Elevating suggests improvement or uplifting, which does not directly relate to the widespread nature of storytelling.
    
• Uncommon and unknown both imply rarity, which contradicts the idea of storytelling being widespread.

Thus, universal is the most appropriate choice, highlighting that storytelling was a shared practice across different societies.

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