Final answer:
Five US Marines were awarded the Medal of Honor for their valor during the Boxer Rebellion, a conflict at the end of the 19th century when an alliance of foreign nations, including the US, intervened to suppress an anti-foreign and anti-Christian uprising in China.
Step-by-step explanation:
The answer to how many Marines were awarded the Medal of Honor (MoH) for their actions during the Boxer Rebellion is C) Five. During the conflict, which occurred at the end of the 19th century, the Boxers sought to eliminate foreign influence and started a siege in Beijing against the international legations. The United States, as part of an eight-nation alliance, intervened with troops to defend these legations and suppress the rebellion.
In recognition of acts of valor and bravery during this conflict, five US Marines were awarded the Medal of Honor, the highest military decoration awarded by the United States government. This decoration recognizes those who have distinguished themselves by acts of valor at the risk of their life above and beyond the call of duty.