A popular keyboard form in which the main theme (subject) is presented in imitation in several parts is called a

The chalumeau is?

a) a single-reed instrument that emerged in the late 17th century and that eventually developed into the clarinet b) a double-reed instrument that emerged in the late 17th century and that eventually developed into the bassoon c) a double-reed instrument that emerged in the late 17th century and that eventually developed into the oboe d) a double-reed instrument that emerged in the late 17th century and that eventually developed into the oboe d'amore

Most Italian churches, such as Pisa, retained the _____ of Early Christian basilicas

a. two-towered facades b. timber roofing c. radiating chapels d. stone vaulting