(1) A small dose of widely used tranquilizer allows people to lie during lie detector tests without being discovered. The stress responses that lie detector tests measure can be inhibited by the drug without noticeable side effects.

An assumption of the passage is that

(A) tranquilizers are always an effective treatment for stress
(B) the inhibition of stress responses increases subjective stress
(C) stress as measured by a lie detector is similar to everyday stress
(D) persons who lie during a lie detector test display signs of stress
(E) it is not desirable to reduce stress in everyday situations

(2) A small dose of widely used tranquilizer allows people to lie during lie detector tests without being discovered. The stress responses that lie detector tests measure can be inhibited by the drug without noticeable side effects. One of the implications of this fact is that the drug can
also be effective in reducing stress in everyday situations.

An assumption of the passage is that

(A) tranquilizers are always an effective treatment for stress
(B) the inhibition of stress responses increases subjective stress
(C) stress as measured by a lie detector is similar to everyday stress
(D) persons who lie during a lie detector test display signs of stress
(E) it is not desirable to reduce stress in everyday situations

agreed,
1D
2C

D
C here too.

Without the "always" in 1) A might have been a contender.