Read the excerpt from "A Thousand Years of Guessing." But making just one book like the Exeter Book often took years. Because it was dark inside the buildings and candles were expensive, monk-scribes sat outdoors in sheltered courtyards and copied entire manuscripts by hand. They used sheepskin parchment that they had scraped smooth, ink made from soot or oak bark boiled in vinegar, and quill pens that they constantly had to sharpen with little knives. The monks copied by hand about six hours a day, even when it was cold. And they had to keep silent while they worked.

Which detail from the excerpt best supports the inference that the creation of the Exeter Riddle Book was more important than the monks' comfort?

"They used sheepskin parchment that they had scraped smooth, ink made from soot or oak bark boiled in vinegar."

"The monks copied by hand about six hours a day, even when it was cold."

"Because it was dark inside the buildings and candles were expensive, monk-scribes sat outdoors in sheltered courtyards…"

"But making just one book like the Exeter Book often took years."