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If the movie is perhaps a documentary, then it is telling you factual information of actual events (includes pictures or pictures of actual documents or events); this makes it a primary source.
If the movie is based off of real events, has factual information, but also has added information to create a well-rounded plot, this makes it a secondary source.
You didn't list options, but I'll suggest an item which famously occurred during Warren G. Harding's presidency:
<h2>The Teapot Dome Scandal</h2>
This was a scandal in which one of President Harding's cabinet members illegally leased oil reserves. President Harding was not directly implicated in the scandal, but was affected by it. After President Harding transferred supervision of the naval oil-reserve lands from the navy to the Department of the Interior in 1921, Secretary of the Interior Albert Bacon Fall secretly gave Harry Sinclair of the Mammoth Oil Company exclusive rights to the Teapot Dome reserves in Wyoming. He granted a similar deal to another oil company executive. The secret leases came under Congressional investigation. Congress directed President Harding to cancel the leases, and the Supreme Court ruled that Harding's transfer of authority to Interior Secretary Fall had been illegal. The whole affair took a toll on President Harding's health. He died in office in 1923.
Answer:
1. Cultural exchange of gunpowder
2. Cross Cultural exchange was Through Europeans.
3. Spread of islam
Explanation:
1. There was a cultural exchange of gunpowder by the Mongols. Tang and Song dynasties were non nomadic and used gun powder. When expanses of land like southern Asia and eastern Europe was being conquered by nomadic Mongols, gunpowder was spread to non nomadic areas.
2. Cross cultural exchange was through European dominated trade, this was by the Dutch and Portuguese. Trade was mostly sea based and central Asian nomads had no access to this. This development limited Central Asia in cross regional exchange.
3. One cross cultural exchange was that Non nomadic merchants spread Islam to areas in India.
