The author's tone in this passage is ______.

A．patients can get without doctors' prescriptions
B．can relieve the symptoms of a disease
C．attack the organism that causes a disease
D．tend to be complex and powerful synthetic drugs

A．their English is not good enough
B．they are afraid they might meet with unfair judgment in these areas
C．there is a wide difference between Asian and Western cultures
D．they know little about American culture and society