Which of the following statements is true, according to the research findings reported in

A. Repeated hearings of complex pieces of music are enjoyable and not tiresome.
B. Repeated hearings of complex pieces of music are tiresome at first and then become enjoyable.
C. Repeated hearings of simple songs are more enjoyable than those of complex pieces of music.
D. Repeated hearings of simple songs become tiresome sooner than those of complex pieces of music.