Which “four powers” agreed to the four power treaty of 1921?

The Four Powers that agreed to the Four Power Treaty of 1921 is the major allies in Asia, Europe, and in the Americas.  The four are:

Japan, United Kingdom, France, & the United States.

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no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.

i would say the executive branch is because the executive branch is in charge of enforcing the laws and judicial branch is in charge of enforcing but the executive branch is most responsible for it all so i would have to say the executive branch.