Final answer:
Bone has the highest attenuation coefficient among the given options due to its density and absorbent properties. The option (1) is correct.
Step-by-step explanation:
The highest attenuation coefficient is found in bone. In ultrasound, attenuation refers to the reduction in intensity or amplitude of the sound wave as it travels through a medium. The attenuation coefficient represents how quickly the intensity decreases as the sound travels through the material.
Bone has the highest attenuation coefficient among the given options because it is a dense and highly absorbent material. The denser the material, the more sound energy it absorbs, resulting in a higher attenuation coefficient. Therefore, option (1) is correct.