I think the letter B is the answer
Answer:
The Gentlemen's Agreement of 1907 (日米紳士協約, Nichibei Shinshi Kyōyaku) was an informal agreement between the United States of America and the Empire of Japan whereby the United States would not impose restrictions on Japanese immigration and Japan would not allow further emigration to the United States.
Signed: February 15, 1907
Explanation:
