Most of Western music since the Renaissance has beene based on a seven-note scale known as the diatonic scale,but when did the seale originate A fragment of acbone flute excavated at a Neanderthal campsite has four holes ,which are spaced in exactly the right way for playing the third through sixth notes of a diatonic scale. The entire flute must surely have had more holes, and the flute was made from a bone that was long enough for these additional holes to have allowed a complete diatonic scale to be played . Therefore, the Neanderthals who made the flute probably used diatonic musical scale. In the context of the passage ,what role does the underlined sentence play? A. It suggests a hypothesis about the construction of the NeanderthaF flute. B. It confirms the existence of a complete diatonic scale in Neanderthal times. C. It describes the physical appearance of the bone flute found. D. It provides evidence for the Neanderthals' understanding of musical theory.