Which "four powers " agreed to the four power treaty of 1921? . a) the u. s., russia, japan, and china . b) the u. s., britain, france, and japan . c) the u. s., britain, france, and germany . d) the u. s., britain, germany, and russia . .

"The U.S., Britain, France, and Japan" were the "four powers" among the following choices given in the question that agreed to the Four Power Treaty of 1921. The correct option among all the options that are given in the question is the second option or option "b". I hope the answer helped you.