The Strings of a Guitar Vibrate at Different Frequencies

Multiple Choice

The strings of a guitar vibrate at different frequencies. They have different thicknesses because

A) a thinner string has more tension than a thicker string and vibrates at a higher frequency.
B) a thicker string has more tension than a thinner string and vibrates at a higher frequency.
C) a thicker, more massive string vibrates at a lower frequency than a thinner string of the same length and tension.
D) a thinner, less massive string vibrates less frequently than a thicker string of the same length and tension.