Atomic bombings of Hiroshima and Nagasaki
Answer:
(B) Cheaper
Explanation: Books were written by hand, which made them rare and expensive. The invention of the printing press, using movable type, by Johannes Gutenberg in 1440 made books cheaper to produce, encouraging writing and the sharing of knowledge.
For the problem it would have to be b I am pretty Shute
Answer:
It allowed then to build perfect settlements
