In what year was the most recent constitutional amendment ratified?

The most recent constitutional amendment ratified is the 27th Amendment, which was completed and officially ratified in 1992. This amendment addresses congressional pay increases, stipulating that any change in the salaries of Senators and Representatives cannot take effect until after the next election of Representatives. The ratification process for this amendment began on September 25, 1789, but it took over 200 years for it to reach the required number of state approvals.

In the context of this question, the year 1992 holds significance as it marks the official conclusion of a very long ratification process, and it is the last time an amendment has been added to the Constitution. Other years listed do not correspond to any newly ratified amendments; thus, 1992 is the only correct choice reflecting the latest addition to the Constitution.