Why are there so many allusions, or references, to the Old Testament in Puritan literature?

Question options:

The Old Testament was the only book they brought with them when they established their new colony.

The Puritans wanted to write literature seen as more important than the Bible, so they only used the most important parts in their writing.

They wanted to be seen as more devout than the English, and they used lots of references to the Bible in order to prove their deep faith.

They were extremely devout Christians and their every day lives were guided by their faith.