Final answer:
The Production Code Administration (PCA) was the office responsible for preserving movie morality during the studio era.
Step-by-step explanation:
The office that was in charge of preserving the morality of movies during the studio era is known as the Production Code Administration (PCA). Also known as the Hays Code, the PCA established a set of moral guidelines that were to be applied to the United States motion pictures released by major studios from 1934 to 1968. While the activities of the Federal Communications Commission (FCC) involve regulating what is said and shown on broadcast television and the Motion Picture Association of America (MPAA) is known for its movie rating system, it was the PCA that directly enforced moral standards in films during that period. The American Film Institute (AFI) is more focused on improving and preserving the history of movies and is not involved in enforcing moral standards.