Which Is True of the Relative Speed of the Upper

Question 23
Multiple Choice

Which is true of the relative speed of the upper and lower voices during the organum section of "Alleluia.Diffusa est gratia"? A) All the voices move together. B) The higher voices move more quickly than the lower voices. C) The higher voices move more slowly than the lower voices. D) The relative speeds of the upper and lower voice parts change constantly, for variety.