Answer:
I think it Is her forgive me if I’m wrong
Explanation:
'by hand' is a prepositional phrase which is functioning as an adverb phrase to explain HOW all books in Europe were once written.
Adverb phrases give additional details - like HOW something happens.
Last sentence
explain: sentence 1 didn't close off the speech marks sentence 2 speech marks weren't necessary as it was indirect speech and sentence 3 did not put a comma at the end of the speech marks.
hope that helps!