Which statement best describes MP3 compression?

• A. It preserves all original data without loss.
• B. It is a lossless format.
• C. It cannot be played on common devices.
• D. It achieves small file sizes by lossy compression, reducing quality.

Answer: (D)

MP3 compression is a lossy process: it reduces file size by discarding parts of the audio data that aren’t easily heard by the human ear. By dropping these elements and using a chosen bit rate, it creates much smaller files at the cost of some fidelity. This is why MP3 isn’t preserving every bit of the original recording and isn’t a lossless format. It’s also designed to work on virtually all common devices, so it can be played widely. So the statement that best describes MP3 compression is that it achieves small file sizes by using lossy compression, which reduces quality. The other options imply it preserves all data, or that it’s lossless, or that it can’t be played on common devices, which isn’t accurate.