B. Brass
C. Strings
D. Percussion
The correct answer is D. Percussion.
The main orchestral groups or families are:
- Woodwinds (e.g. flute, clarinet, oboe, bassoon)
- Brass (e.g. trumpet, trombone, tuba, French horn)
- Strings (e.g. violin, viola, cello, double bass)
Percussion is not a main orchestral group or family, but rather a category of instruments that includes a wide variety of instruments such as drums, cymbals, and xylophone.