It should be 1929 - 1932 because that's when it dropped the most. All of the other choices have sections where it rises back up.
The Confederacy Was Fighting On Their Own Land So They Had That Advantage And They Were Better In Battle Tactics, Military Knowledge, And Decision-Making.
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In 1511 Albuquerque captured Malacca; from this he could control the trade from the East Indies and the coast of China.
"They resulted in military victory over Islamic society" was technically not one of the ways in which the Crusades benefited European society, since this conquest had no major positive repercussions.