Which statement best expresses the main idea of the passage about Johannes Gutenberg?
Read the passage: Before the middle of the fifteenth century, most books in Europe were copied by hand, a slow process that made them rare and costly. Around 1440, Johannes Gutenberg, a goldsmith from Mainz in Germany, began developing a printing system that combined several ideas. He cast individual letters in metal so that they could be arranged, inked and reused many times. He also used an oil-based ink that stuck well to metal and adapted a screw press of the kind used for pressing grapes. His famous Bible was completed in the mid-1450s. Within a few decades, printing shops had opened in many European cities, books became far cheaper, and new ideas could spread more quickly than ever before.
Correct answer C. Gutenberg's printing system made books cheaper and helped ideas spread.
The passage explains how Gutenberg combined metal type, ink and a press, leading to cheaper books and the faster spread of ideas, which is its central point.
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