Which Statement Best Represents the Interaction of Classical and Operant

Which statement best represents the interaction of classical and operant conditioning for avoidance learning

A)  Operant conditioning of escape is followed by classical avoidance. 
B)  Operant avoidance is positively reinforced by a pleasant unconditional stimulus. 
C)  Classical fear conditioning is followed by operant negative reinforcement. 
D)  Classical conditioning of feelings of safety is reinforced by operant punishment.