The benefits of fighting the Crusades are apparent in this letter from a Crusader to his wife, Your answer would be, Letter Choice, (A); Devotion to God and Great Wealth.
Explanation:
My take would be, During periods where there was no fighting going on; there was a chance to set up a business, and trade ideas and products. This was an easy and ideal way to get money. One example of a Medieval Crusader writing a letter to his wife goes like this “My dear wife, I now have twice as much gold, silver and other riches as I had before I went on this crusade.” So, Because, of this found new wealth, he is more devoted, god and his wealth.
Hope that helps!!!! : )