Bunuel
A smoker trying to quit is more likely to succeed if his or her doctor greatly exaggerates the dangers of smoking. Similar strategies can be used to break other habits. But since such strategies involve deception, individuals cannot easily adopt them unless a doctor or some other third party provides the warning.
Which one of the following is an assumption on which the argument depends?
A. People tend to believe whatever doctors tell them.
B. Most of the techniques that help people quit smoking can also help people break other habits.
C. The more the relevant danger is exaggerated, the more likely one is to break one's habit.
D. People generally do not find it easy to deceive themselves.
E. A doctor is justified in deceiving a patient whenever doing so is likely to make the patient healthier.
Conclusion: Individuals can't adapt unless doctor or a 3rd party gives warning
Let's say individuals can do it without doctor/ 3rd party. This means there are other tools to achieve deception.
therefore, My answer would be something which says that there is no other way apart from the doctor or 3rd party to achieve deception
a) contender
b) irrelevant
c) irrelevant
d) contender
e) irrelevant
Let's apply negation test to A and D. Clearly A can't break the argument as in absence of doctors, 3rd party can deceive
But incase of D, it completely shatters the argument.
Hence D