The right option is; D. traveling
Georg Von Békésy won a Nobel Prize for his research on the basilar membrane, which showed that it contains a traveling wave.
Georg Von Békésy won a Nobel Prize in Physiology and Medicine in 1961 for his discovery and research on the basilar membrane. Georg Von Békésy discovered the traveling waves along the basilar membrane that were created by sound. He sprinkled silver particles on the transparent basilar membrane, and by examining the movement of the silver particles, he was able to observe the shape of these waves. Based on the frequency of the sound, the traveling waves attain high amplitude in various directions.
