What sound characteristics describe the letter 'd'?

The letter 'd' is classified as a stop sound and voiced. This means that when producing the sound of 'd', the airflow is momentarily stopped by placing the tongue against the roof of the mouth, creating a phonetic block. This blocking of breath is characteristic of stop sounds. Furthermore, 'd' is considered voiced because the vocal cords vibrate when producing this sound.

In contrast, options that refer to 'voiceless' are incorrect because the sound of 'd' inherently involves vocal cord vibration, which is fundamental to its phonetic identity. Similarly, defining it as a continuous sound is inaccurate; stop sounds, such as 'd', do not allow for a continuous flow of air but instead have distinct closure and release phases. Therefore, the correct identification of 'd' being both a stop sound and voiced accurately captures its phonetic characteristics.