The effectiveness of a drug on a measurable variable, such as drowsine

Question

The effectiveness of a drug on a measurable variable, such as drowsiness, may depend on  if the level for that variable is higher or lower at the time of the drug’s administration .
A. if the level for that variable is higher or lower at the time of the drug’s administration
B. if the level of that variable, higher or lower, is at the time of the drug’s administration
C. the level of that variable at the time of the drug’s administration
D. whether the level for the variable at the time of the drug’s administration is high or low
E. whether the level of variables during the time of the administration of the drug is higher or lower

Source: McGraw Hill GMAT

HKD1710 · Accepted Answer

Hi  adamodom1 ,

A & B 
Whether Vs If --whether wins. (If is used in conditionals and that is not the case here). SO A & B is out.

E 
Higher or lower? We are not comparing the level with any other level so use of comparative is not correct. 
variables - this is wrong wording. Its variable not variableS (however GMAT never would test such a silly thing) - stay away from such source.
 
 C   Vs  D  (3 aspects)
 Ambiguity :
for the variable - This does not show if it is the same variable mentioned in the start of the sentence or some other variable. C clears this confusing using "THAT VARIABLE"

Redundancy :
If you talk about level then do you not mean high or low? yeah! Kind of redundant.

Brevity :
C definitely uses less words keeping the meaning correct.

kivalo · Answer

It's C vs. D here.
'depends on whether' is correct, but 'level for that variable' is not. Therefore, C is correct.

matthewsmith_89 · Answer

The effectiveness of a drug on a measurable variable, such as drowsiness, may depend on if the level for that variable is higher or lower at the time of the drug’s administration.
A.  if  the level for that variable is higher or lower at the time of the drug’s administration
B.  if  the level of that variable, higher or lower, is at the time of the drug’s administration
C. the level of that variable at the time of the drug’s administration
D. whether the level for the variable at the time of the drug’s administration is high or low  High or low is redundant  
E. whether the level of variables during the time of the administration of the drug is  higher or lower

Answer is C

GMATNinjaTwo · Answer

Great reply by HKD1710.. also in choice D, "level  of  the variable" would be better than "level  for  the variable" (ie "He had a high level of iron in his blood" vs "He had a high level for iron in his blood."; regardless, as HKD1710 already explained, choice D is wrong for other reasons.

cpn · Answer

A and B choices use 'if'...between if and whether, we always should go for whether...so A and B are out. 
D and E use 'whether' but D says variable for which is wrong.
E says variable during the time of administration...it should be ' at the time of'
So C is the best if all
Answer C

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The effectiveness of a drug on a measurable variable, such as drowsine

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The effectiveness of a drug on a measurable variable, such as drowsine

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