To calculate the wavelength of a sound wave, you can use the formula:
\[ \text{Wavelength} = \frac{\text{Speed of Sound}}{\text{Frequency}} \]
In this case, the speed of sound is approximately 340 m/s, and the frequency of the note G (above middle C) is about 392 Hz.
Plugging in the values:
\[ \text{Wavelength} = \frac{340 , \text{m/s}}{392 , \text{Hz}} \approx 0.867 , \text{m} \]
Rounding this value gives approximately 0.87 meters.
Therefore, the correct answer is:
0.87 meters.