A small dose of a widely used tranquilizer allows people to lie during

OFFICIAL EXPLANATION

To show the implication from the facts presented, that the tranquilizer can be effective in reducing stress in everyday situations one must assume that the stress in the everyday situation is treatable in the same way as the stress responses measured by the lie detector. The third response most closely describes this assumption and is the correction answer.

A is incorrect. The passage discusses one situation where a specific tranquilizer is effective in inhibiting stress responses. However, there is no implication or assumption that tranquilizers in general are always an effective treatment for all kinds of stress. The second answer choice is incorrect. The passage presupposes that the inhibition of stress responses indicates a reduction in stress. Thus, there is no assumption in the passage that an inhibition of the response increases subjective stress. D is also incorrect. The passage leaves open the possibility that there are people who display no signs of stress when lying. In addition, the passage states that tranquilizers will allow a person to lie without displaying signs of stress. The last answer choice is incorrect. The passage deals with the effects of a mild tranquilizer on stress. For the statements in the passage to be true, it is not necessary to make assumptions about whether or not it is desirable to reduce stress in everyday situations.