Answer: I'd say the sound recording and shooting the right setup and focus
Explanation: You have to be able to hear the actors or characters talk, and the focus makes sure that you can see clearly. That's what I'd answer.
By placing the figure towards the center. I hope this helps! :)
The answer is B.
When two voices sing exactly the same note simultaneously, the voices are singing In Unison or unisono in musical Term.