According to the text, the best-selling recording artist of the 1970s:

The first major hit for the Rolling Stones (and one that they wrote themselves):

a. "Under My Thumb" b. "(I Can't Get No) Satisfaction" c. "Jumping Jack Flash" d. "Ruby Tuesda

What is the interval between two notes (one higher than the other) in which the upper has exactly double the frequency of the lower?

A. Chord B. Unison C. Octave D. Pitch