Late One Night the Police Discover Warren,a Known Drug Abuser,throwing

Late one night the police discover Warren,a known drug abuser,throwing a brick at the window of a closed pharmacy.Warren throws the brick several times before the police intercede.When questioned,Warren admits he was trying to break into the pharmacy to obtain drugs.Unknown to Warren,the pharmacy was equipped with shatter-resistant glass.Warren has committed:

A) criminal conspiracy (burglary) because he engaged in an overt act in furtherance of his efforts to enter the pharmacy.
B) criminal attempt (possession of a controlled substance) .
C) no offense due to factual impossibility because it was physically impossible for him to break into the pharmacy.
D) criminal attempt (burglary) because the fact he could not break the glass is no defense.