The correct order of key events regarding the exploration of space is:
first humans in space, first space shuttle flights, first humans on the moon.
Here’s a brief overview of these events:
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First humans in space - This occurred on April 12, 1961, when Yuri Gagarin completed a single orbit of Earth aboard Vostok 1.
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First space shuttle flights - The first flight of the space shuttle, STS-1, took place on April 12, 1981.
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First humans on the moon - This occurred during NASA's Apollo 11 mission on July 20, 1969, when Neil Armstrong and Buzz Aldrin became the first humans to set foot on the lunar surface.
Therefore, the second response is the correct one.