What type of composition is Felix Mendelssohn's Elijah?

Which of the following is a true statement about this selection?

a) it features short repeated sections known as ritornellos b) it features short repeated sections known as puncta c) it features lengthy repeated sections known as rounds d) there are no repeated sections

The scene-shifting method of changing wings and back shutters that was developed by Italian Giacomo Torelli is known as the

A. corral. B. pole-and-chariot system. C. alojera. D. groove system.