The correct answer is A. Each program was based on the knowledge of the previous ones.
The Mercury program was the first American manned space program developed between 1961 and 1963 in the framework of the space race with the Soviet Union.
Based on the knowledge provided by the Mercury program, in 1965 NASA launched the second American manned space program, Gemini, whose main goal was to develop the ability necessary for space encounter and coupling.
These abilities were fundamental for the third program, the Apollo missions, whose main objective was to put the first men on the moon, a goal that was accomplished in 1969.
Marquis de Lafayette helped to train the American colonists and even served in battle with them. Lafayette first came to the American colonies in 1777. Upon arrival, was appointed a Major General in the colonial army. From there, he taught the American colonists military techniques, strategies, and other important information needed to defeat the British. He even fought for the American colonists in the Battle of Brandywine. His help was imperative to the colonists success against the British.
Kublai Khan is known and revered for his civilian and
administrative, not his military achievements. Grandson of Genghis Khan,
Kublai sought to govern rather than to exploit and devastate the vast
domains bequeathed to him by two generations of Mongol conquests. He
made the transition from a nomadic conqueror from the steppes to
effective ruler of a sedentary society. Ironically, however, his reign
witnessed the Mongols’ most remarkable military success, the subjugation
of the Southern Sung dynasty of China, and simultaneously their
greatest military fiascos, the failed naval expeditions against Japan
and Java.
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Zheng He belongs to the Ming dynasty.
