Hi. I am assuming you had a multiple choice question because of the way your sentence is written? The Domestic Policy is not a part of the U.S. foreign policy.
Hope this helps.
Take care,
Diana
The 16th amendment in 1913 permits Congress to lay and collect taxes on incomes, from whatever source derived, without apportioning it among the states or basing it on the US Census. Ratification was completed on February 3, 1913. Before that customs duties and excise taxes were the primary sources of federal revenue. Answer: The ratification of the 16th amendment.
Should be B, the Geneva Accords!