What refers to the distance between two sound frequencies or pitches?

a)tone
b)octave
c)interval
d) rhythm

What is english artist and critic roger fry famous for?

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?