The graph below shows the range of variation among population members for a trait determined by multiple genes. 
If this population is subject to stabilizing selection for several generations, which of the distributions would be most likely to result?
Definitions:
Sound Wave
A type of pressure wave generated by vibrating objects, which travels through a medium (such as air or water) and is perceived as sound when it reaches a human ear.
Timbre
The quality of a sound that distinguishes it from other sounds of the same pitch and volume.
Sound Wave
A type of pressure wave caused by the vibration of an object, which travels through a medium (such as air) and is perceived as sound when it reaches a human ear.
Frequencies
The number of occurrences of a repeating event per unit of time, often used in the context of sound waves or electromagnetic waves.
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