Which number sequence represents the proportions of Nuper rosarum flores?

The Christian Crusades

a. began as an effort to rescue Jerusalem from the Muslims. b. were commonly fought by the younger sons of the feudal nobility. c. were an economic boon to Italian merchants. d. All these answers are correct.

Which decade experienced a comeback for swing and bebop, but also turned toward inclusion of world music?

A. the 1980s. B. the 1990s. C. the 1970s. D. the 1960s.