Answer:
B, becaus Clara Barton was a nurse in the civil war
The above system of United States Constitution is showing three organs of the state i.e Legislative branch, Executive branch and the Judicial branch.
And below each division, their works are given. Aswecan were that, each of the organ is at same height which shows that they are practicing equal powers and they don't interrupt in each others work.
They practice the system of <u>Checks</u><u> </u><u>and</u><u> </u><u>Balances</u> to ensure that none of the organ is enjoying and grabbing too much.
So, the most appropriate option is:

Checks and balances system.
And, we are done !!
#CarryOnLearning...
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Japan strongly and passionately defended two Jima because it was considered part of the Japanese homeland.
During World War 1 the Armenians were divided between Ottoman and Russia.
Explanation:
Majority of the Christian Armenians lived with the Kurd and the Muslim Turks, Christian Greek and many other groups. When the war took took place many Armenians took it as an opportunity to start a riot and started attacking their Muslim neighbors and also started to kill some of them. They said they were doing this only because of Russia.The Ottoman government now started acting in a different way , he started killing the Armenians although some were not included in the war.
When the Russians came to know regarding the atrocities they tried to save the Armenians from the Ottoman but failed and were beaten badly as they did not have a proper plan to attack at that time.