Final answer:
Federal agencies implement the ADA by writing regulations, such as ensuring deaf applicants can have a sign language interpreter during job interviews, which exemplifies their role in enforcing disability rights and reasonable accommodations.
Step-by-step explanation:
The activity that is an example of the involvement of federal agencies in implementing the Americans with Disabilities Act (ADA) is B. Writing regulations stipulating that deaf job applicants have a right to a sign language interpreter during a job interview. This activity falls under the responsibility of federal agencies to enforce the ADA, which requires employers to make reasonable accommodations to allow individuals with disabilities to have equal employment opportunities. This involves creating specific regulations that clarify the rights of individuals with disabilities in various situations, including job interviews.