How and why was the constitution amended follwing roosevelts death

Washington's two-term limit became the unwritten rule for all Presidents until 1940. In 1940, President Franklin Delano Roosevelt won a third term. ... Roosevelt was the first and only President to serve more than two terms. The amendment was passed by Congress in 1947, and was ratified by the states on February 27, 1951.

Explanation:

when in doubt choose c

it's what my teacher told my class when we were going into psats