Which scale is a D major scale? help plss

What is the term for a recurrent musical section between various contrasting sections? a. concerto grosso b. basso ostinato c. fugue d. ritornello

To keep food safe throughout the flow of food create?

What is one popular pop artist or group (from today or from the past)? why does this person/group's music fit into the pop genre? why do you think the person/group was successful with their music?