Roberto and Thomas live in a university hall of residence Roberto values playing loud music at a value of €100. Thomas values Pease and quiet at a value of €150. Which of the following statements is true ?

A. It is efficient for Roberto to stop playing loud music regardless of who has the property right to the level of sound
B. it is efficient for Roberto to continue to play loud music
C. It is efficient for Roberto to stop playing loud music only if Thomas has the property right to peace and quiet
D. It is efficient for Roberto to stop playing loud music only if Roberto has the property right to play loud music