A fairy tales was what was commonly used to teach children how to read.
These are book that tells story intended for children that features fanciful and wondrous characters such as elves, goblins, wizards.
Like all other stories, the fairy tales are meant to entertain, but that's secondary. Unlike today's novels, their main purpose is to give a moral in a way the audience will remember. They exist to teach a clear lesson.
Hence, the fairy tales was what was commonly used to teach children how to read.
Therefore, the Option C is correct.
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