In which of the following situations is Defendant most likely to be not guilty of the charge made?
A. Believing that state law made it a crime to purchase Valium without a prescription, Defendant purchased without a prescription a certain quantity of Valium. Unknown to Defendant, the state legislature had repealed the statute, and Valium could be legally purchased without a prescription. Defendant is charged with attempting to purchase Valium without a prescription.
B. While in the course of a fight, Defendant, intending to kill Stan, ran up and stabbed Stan from behind. Unknown to Defendant, Stan had been stabbed through the chest only seconds before by another participant in the fight, killing him instantly. Defendant is charged with attempted murder.
C. Defendant misrepresented his identity to a garage in order to take possession of an automobile that had been left with the garage for repairs earlier that week. The owner of the garage was not deceived and refused to turn over possession. Defendant is charged with attempting to obtain property by false pretenses.
D. Police arrested Robber as he was leaving a house where he had stolen a good deal of property. As part of a plea-bargain arrangement, Robber took the property to Defendant and offered to sell it. Defendant, believing the property to be stolen, purchased it. Defendant is charged with attempting to receive stolen property. 
Choose A, B, C or D as your solution.
A