The correct answer is:
The children are wearing loose clothing. The children are exposed to dangerous machinery. The children are not wearing any protective gear.
These are some of the dangers these child workers were exposed to.

Answer:
One of the instances was Mongol conquest of China setting up Yuan dynasty under Kublai Khan's rule.
Explanation:
The Mongols were nomads who made small incursions to conquer new lands as it happened with China. The tribes of the Mongols and Turks were warriors eager to conquer territories, they came to Chinese territory to overthrow their empires and form new emperors.
The Mongols began their conquest in China using the strength of their armies. In the 13th century, after sixty years of fighting, the Chinese empire was defeated.
The Mongols defeating Jin, Dali, and Xia dynasty, establishing a new empire, the Yuan dynasty led by Kublai Khan. This conquest is characterized by being the first time that China was dominated by a foreign leader.
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Option C, that He went undercover as a worker in a meat-packing plant is the right answer.
Upton Sinclair's (Muckraking Journalist) Socialist Policy urged him to write a Novel called “The Jungle” in 1906, which presented the harsh conditions and abused lives of the immigrants, particularly in the Meatpacking industry of the United States. However, To achieve his goal of presenting this <u>hard condition of the workers he went undercover. </u>Therefore, He used the account of His own investigation to describe the social and economic injustice in the Novel. The Promotion of Socialism in the United States was his main motif while writing the Novel.
The most significant impact of the book can be seen in terms of the “ Pure Food and Drug Act” passed by the government a few months later.
Answer A market economy brings a better government and stability for people.
Space-based satellites
Advantages:
• difficult to shoot down
• HD resolution pictures
• safe
• cost effective
Disadvantages
• hard to maintain
• unreliable at times (signal interference)
SR-71 blackbird
Advantages
• high quality imagery (can be infrared)
• demand-based usability
• high propagation delay
Disadvantages
• costly
• demand-based usability
• less safer