Final answer:
The NAD produced films in sign language to make information and entertainment accessible to the deaf, preserve ASL, and educate the hearing public about deaf culture.
Step-by-step explanation:
The National Association of the Deaf (NAD) produced films in sign language to provide the deaf community with access to information and entertainment in a language that is most accessible to them. This initiative was also crucial for preserving American Sign Language (ASL), educating hearing audiences about the deaf culture, and advocating for the rights of deaf individuals. By creating films in sign language, the NAD fostered a stronger sense of identity and community among deaf people while also providing a vital tool for historical documentation of sign language use.