Final answer:
The Diamond Sutra is the oldest known printed book, made using block printing in 868 C.E.
Step-by-step explanation:
The statement is true.
The Diamond Sutra, printed around 868 C.E., is indeed the oldest known printed book.
Block printing, a technique invented in China during the Tang Dynasty, was used to produce multiple copies of the Diamond Sutra and other Buddhist scriptures. The Diamond Sutra is a sacred Buddhist text that was carved into wooden blocks, inked, and then pressed onto paper, making it more accessible and allowing for wider distribution.