When talking to a person with a hearing disability, you should:
a. speak in a normal tone and make sure your lips are visible.
b. wait until a sign language interpreter is available to assist.
c. assume that they need to have information written, not spoken.
d. shout at them to make it easier for them to hear you.

When a person has a hearing disability, you should speak in a normal time and make sure that your lips are visible. The correct answer is A.  Many people with hearing disabilities can read lips as long as you speak in normal tones and not rapidly or over exaggerated. There is no need to wait for an interpreter unless the hearing impaired person can't understand anything you are saying to them.