(A) ** 1776, the year the U.S declared its independence from England
(B) 1783, the end of the American Revolution
(C) 1789, George Washington’s inauguration
(D) 1776, the year the U.S. declared its independence from France
EXPLANATIONS BELOW
Concept note-1: -Literally, “87 years ago” (score sense: “group of 20”) the beginning of the Gettysburg Address made on November 19, 1863, by United States President Abraham Lincoln (1809–1865).
Concept note-2: -four·score ˈfȯr-ˈskȯr. : being four times twenty : eighty.