Each of the following items in this section consists of a sentence, parts of which have been jumbled. These parts have been labeled as P, Q, R, and S. You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly.

over the years, excavations /(P) behavior of the volcano /(Q) of Pompeii and Herculaneum have revealed /(R) a great deal about the /(S)