Which instrument has a range of F3 to F6?

The vibraphone is the correct choice, as it is specifically designed with a range that begins at F3 and extends to F6. This instrument consists of metal bars that are struck with mallets, producing a resonant sound that is enhanced by its motor-driven resonators. The vibraphone's range allows for a wide variety of musical expressions, making it a versatile instrument in both solo and ensemble contexts.

The other instruments have different ranges. The celeste, for instance, typically has a higher range that doesn't match the vibraphone's specifications. The marimba generally covers a range starting from C2 and extends to at least C7, which is also outside the specified range. Lastly, the organ's range can vary significantly but typically includes lower notes beyond the vibraphone's range. Thus, if one is looking specifically for an instrument that covers the range from F3 to F6, the vibraphone is the correct choice.