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A
1776
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B
1787
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C
1800
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D
1865
Why this is the answer
The Constitution was written in 1787 at the Constitutional Convention in Philadelphia, Pennsylvania. It was signed on September 17, 1787. It was ratified (officially approved) in 1788 when New Hampshire became the ninth state to ratify it. The Constitution went into effect in 1789. REMEMBER: 1776 = Declaration of Independence; 1787 = Constitution written; 1791 = Bill of Rights (first 10 amendments) ratified. USCIS Question 26 (65/20 list): 'What did the Declaration of Independence do?' — Different question. 'When was the Constitution written?' — Answer: 1787.
Source: USCIS Civics Question (65/20) — Constitution Written