Choose the Answer Which Best Rewords the Italicized Portion

Multiple Choice

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
One of her first votes was against declaring war on Germany, which marked the United States's entry into World War I.

A) the United States's entry
B) the United States' entry
C) the United State's entries
D) the United States' entries