Answer:
A. It was used by the Catholic Church and in academic settings.
Explanation:
Latin was for 20 centuries the official language of the Church. Academic writing and research was published in Latin. Masses were said in Latin, despite the fact that only the clergy and the best educated people (very few people during the Middle Ages) were the only ones who could speak and understand it. It was only in the second half of the 20th century that the Roman Catholic Church authorized masses in the local and national languages of each country.
I only know that number 4 is wood.
Due to the inflation of the source the currency became worthless.
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