OA:
Argument construction
The State Transport Officer plans to reduce the number of accidents committed by the 18-21 age group by restricting them to drive motorbikes less than 150 cc.
Premise: Motorbikes less than 150 cc are worthless to speedsters.
Conclusion: Restricting the 18-21 age group to drive motorbikes less than 150 cc will reduce the number of accidents they commit.
We can predict the following assumptions based on the premise and the conclusion:
Based on the premise—motorbikes less than 150 cc are worthless to speedsters, the STO plans to restrict the 18-21 age group to drive motorbikes less than 150 cc so that the number of accidents they cause will be reduced. It implies that the STO assumes that speedsters find motorbikes more than 150 cc worth driving.
Predictive Assumption 1: Speedsters find motorbikes more than 150 cc worth driving. Another assumption may be that the STO targets the 18-21 age group. It implies that the STO assumes that most speedsters fall in the 18-21 age group.
Predictive Assumption 2: Most speedsters fall in the 18-21 age group.
The STO also assumes that by imposing a restriction on the 18-21 age group, the youth will comply with it.
Predictive Assumption 3: Speedsters will obey the restriction imposed on them.
Last but not least—the STO assumes that motorbikes less than 150 cc are less prone to causing accidents than motorbikes more than 150 cc.
Predictive Assumption 4: Motorbikes less than 150 cc are less prone to causing accidents than motorbikes more than 150 cc .
(A) This option is inconclusive. ‘Some’ is a tricky quantity word. In the real world, we may equate ‘Some’ to a significant number, but in the GMAT, ‘Some’ may range from anything between 0% to 100%; 0 is excluded, hence it is inconclusive. Had ‘some’ been replaced with ‘many,’ probably the statement would have qualified to be an assumption.
(B) This option is inconsistent. It goes against the premise. No one can challenge the premise, even if in the real world, the opposite may seem true. The premise already states that motorbikes less than 150 cc are worthless to speedsters, hence option C is against the premise, as it states that speedsters drive all types of motorbikes including those less than 150 cc (worthless).
(C) This option is irrelevant. Why speedsters drive fast is not relevant.
(D) This option is out of scope. The penalty aspect is outside the scope of the argument.
(E) This is the correct answer. It is aligned with predictive assumption 1.
The correct answer is option E.