John,realizing That He Is Slowly Dying of a Painful Cancer,asks

John,realizing that he is slowly dying of a painful cancer,asks Carl to kill him.Carl is hesitant,but John executes a document that states in one part,"I hereby consent to the ending of my life by Carl who is acting under my express desires.I hereby direct that Carl should suffer no legal detriment by his actions." When John's body is discovered,Carl is charged with murder.Carl produces the document.What will result?

A) The case against Carl should be dismissed because John consented to Carl's mercy killing.
B) The case against Carl is legally sufficient because John could not consent to his own murder.
C) The case against Carl should be dismissed because it lacks the required element of malice.
D) The case against Carl is legally sufficient because John was obviously legally incompetent.