The correct option is A True
Answer is A.
Thick strings with large diameters vibrate slower and have lower frequencies than thin ones. That is, lower the pitch. A thin string with a 10 millimeter diameter will have a frequency twice as high as one with a larger, 20 millimeter diameter. This means that the thin string will sound one octave above the thicker one. Hence, notes of different frequencies can be produced by vibrating different strings with different diameters.
Hence, the statement is true.