Reply To: PrepTest 56, Section 2, Question 8

August 24, 2016 at 10:05 am #2482
dannypearlberg
Participant

(A) is bad because “most” can mean just over 50%- it doesn’t weaken the argument at all to know that just over 50% of the boulders haven’t been moved more than 100 miles, because that means that just under 50% HAVE been moved more than 100 miles.

(D) does weaken the argument a bit- if there ARE no geological sources of volcanic rock north of this boulder, it seems likely that there WERE none there during the last ice age. True, this answer choice doesn’t rule out the possibility of there being some geological sources of volcanic rock north of this boulder during the last ice age, but that’s ok- it still weakens the argument by telling us that it is likely that there weren’t any.