I think it is D
Hope this help you?
(A)because, "again," isn't a one-syllable word
Answer:
-heard and seen
-seen but not heard
Explanation:
Remember, the best example of a live medium is the television. Therefore, the ability to be heard and seen best describes the live medium because it allows us to see images in a moment of time as they appear.
Sometimes also, a live medium may be seen but not heard, which is common in visuals dedicated to the deaf and speechless individuals.
I believe the answer is A and B
Sorry if I'm wrong