What does bit depth in audio indicate?

• A. It determines how long the track lasts.
• B. It controls the stereo balance automatically.
• C. It sets the sample rate of the file.
• D. It represents the quality of audio; more bits equal better audio quality.

Answer: (D)

Bit depth is about how many bits are used for each sample, which determines how precisely the audio’s amplitude is represented. More bits give more possible amplitude levels, so the dynamic range is larger and quantization noise is reduced. That’s why higher bit depth typically sounds clearer and more detailed, especially in quiet passages or at loud peaks. It doesn’t change how long the track lasts (duration), the stereo balance (panning), or the sample rate (how many samples per second). So saying that more bits equal better audio quality directly describes what bit depth controls.