Final Answer:
The bow that string players usually use to produce sound on their instruments is a slightly curved stick strung tightly with horsehair. so, the correct answer is B) horsehair.
Step-by-step explanation:
The bow used by string players, such as violinists, violists, cellists, and double bassists, is traditionally made with a slightly curved stick and is strung tightly with horsehair. This horsehair is drawn across the strings of the instrument to create vibrations, producing the sound. The use of horsehair allows for a smooth and controlled friction against the strings, producing the desired tone and dynamics.
The choice of horsehair for bow construction is a historical tradition that has proven effective in producing the nuances and variations in sound required by string musicians. The tension and quality of the horsehair, as well as the rosin applied to it, contribute to the player's ability to control the articulation, volume, and expression of the music.
Therefore, option B) horsehair is the correct material used to string the bow for producing sound on string instruments.