Read the excerpt from A Popular History of the Art of Music by W.S.B. Mathews. Then answer the question that follows.

> In his studies for a history of musical notation, Dr. Hugo Riemann quotes an extract from an anonymous manuscript of the tenth century, in which the author gives directions for a set of organ pipes. "Take first," he says, "ten pipes of a proper dimension and of equal length and size. Divide the first pipe into nine parts; eight of these will be the length of the second. Dividing the length of this again into nine parts, eight of these will be the proper length of the third; dividing the first pipe into four parts, three of them will be the length of the fourth; taking the first pipe as three parts, two of them will be the length of the fifth; eight-ninths of this again will give the proper length of the sixth; eight-ninths of this, the length of the seventh; one-half the first, the length of the eighth, or octave."

Which text structure is used in this passage?

A. Cause and effect
B. Sequence
C. Problem and solution
D. Description