The Gates of Paradise are located at the Baptistry of Florence, specifically
on the east entrance of the Baptistry of San Giovanni (Florence Baptistry),
which is situated in front of the Cathedral of Santa Maria del Fiore. The
Gates of Paradise, a set of gilded bronze doors, were created by Lorenzo
Ghiberti between 1425 and 1452 and were placed on the Baptistry's east portal,
facing the Cathedral. Therefore, the correct answer is:
b. florence baptistry