Final answer:
The light should be shined on the speaker's face to assist a hearing-impaired person, as they may rely on lip reading and facial expressions for communication.
Step-by-step explanation:
If a person is hearing impaired and communication is taking place, it is important to ensure proper lighting on the speaker's face. This is necessary because individuals who are hearing impaired often rely on lip reading and facial expressions to understand what is being said. Therefore, the correct answer is A) The person's face, meaning the light should be shined on the face of the person who is speaking, not on the ceiling, caregiver's face, or the floor.