Line Sound is an audio recording intended to be synchronized with film or video but recorded separately.

• A. Line Sound refers to on-location ambient noise recorded live with the actors.
• B. Line Sound is the same as Foley sound.
• C. Line Sound is the term for sound created entirely in a studio.
• D. Line Sound is an audio recording intended to be synchronized with film or video but recorded separately.

Answer: (D)

Line sound refers to the dialogue captured during production on the set, using on‑set microphones like a boom or lavaliers. It’s recorded separately from the camera image so that editors can synchronize the spoken performance with the footage in post-production. This is the standard source for the main dialogue track because it preserves natural timing, breaths, and performance in a real environment, and then it’s aligned with the film later.

Ambient noise recorded on location isn’t the main dialogue track, and Foley refers to sound effects created in post (like footsteps or object sounds), not dialogue. Recording entirely in a studio describes ADR or voiceover work, not the on-set production sound. That makes the described option the best fit.