A. A person commits conspiracy if, with the intent to promote or aid the commission of an offense, such person agrees with one or more persons that at least one of them or another person will engage in conduct constituting the offense and one of the parties commits an overt act in furtherance of the offense, except that an overt act shall not be required if the object of the conspiracy was to commit any felony upon the person of another, or to commit an offense under section 13-1508 or 13-1704.
B. If a person guilty of conspiracy, as defined in subsection A of this section, knows or has reason to know that a person with whom such person conspires to commit an offense has conspired with another person or persons to commit the same offense, such person is guilty of conspiring to commit the offense with such other person or persons, whether or not such person knows their identity.
C. A person who conspires to commit a number of offenses is guilty of only one conspiracy if the multiple offenses are the object of the same agreement or relationship and the degree of the conspiracy shall be determined by the most serious offense conspired to.
D. Conspiracy to commit a class 1 felony is punishable by a sentence of life imprisonment without possibility of release on any basis until the service of twenty-five years, otherwise, conspiracy is an offense of the same class as the most serious offense which is the object of or result of the conspiracy.