What did Karl the criminal mentioned in the case have as her front of the drug ring

A．whose minds are alert and receptive
B．who are highly intelligent
C．who can remember large amounts of information
D．who are good at recognizing different sounds

A．show that taste preference is highly subjective
B．argue that taste testing is an important marketing strategy
C．emphasize that taste and price are closely related to each other
D．recommend that blind tasting be introduced in the quality control of colas