The answer is B. Metaphore
Here is why:
a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable.
"“I had fallen through a trapdoor of depression,”
Hieroglyphs, petroglyphs (pictures carved into rocks), and cuneiform (a writing system using hashmarks on clay tablets) were all early forms of written communication. All of them were precursors to alphabets, which use letters to represent sounds. Grunts are an early (and present-day) form of communication, but they aren't written.
They made it much easier to sell meat.
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