Final answer:
Musical Instruments are grouped by how they produce pitch, with smaller instruments typically creating higher-pitch sounds due to shorter wavelengths compared to larger instruments that produce lower-pitch sounds due to longer wavelengths.
Step-by-step explanation:
The statement that is true is D. Musical Instruments are grouped by how they produce pitch. Musical instruments are often categorized based on the mechanisms they utilize for producing sound, or pitch. For instance, you have wind instruments that produce sound by the musician blowing air through them, string instruments that produce sound when their strings vibrate, and percussion instruments which make a sound when struck.
It is important to note the relationship between the size of a musical instrument and the pitch it produces, which is observed through the physical properties of sound waves. Smaller instruments, like a piccolo, produce higher-pitch sounds due to their ability to create shorter-wavelength sounds, which corresponds to higher frequencies. Conversely, larger instruments, such as a tuba, produce lower-pitch sounds because they create longer-wavelength sounds, which have lower frequencies.