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An omnidirectional microphone is designed to capture sound equally from all directions, making it an ideal choice for capturing ambient sound. Ambient sound refers to the background noise or environment sounds that can enhance the overall audio experience in a recording. This type of microphone allows the user to pick up the natural acoustics of the location rather than focusing on a specific source of sound.

In contrast, a directional microphone is designed to capture sound from a specific direction while rejecting noise from other angles, which would not effectively capture the surrounding ambiance. A lapel microphone, also known as a lavalier microphone, is typically used for individual speakers and is often clipped to clothing, so it focuses on a single person's voice rather than capturing ambient sound. A shotgun microphone is highly directional and is used to capture sound from a specific source from a distance, making it less suitable for capturing general environmental sounds. Therefore, the omnidirectional microphone is the best choice for the task of capturing ambient sound due to its ability to record audio from all directions evenly.