GMAT Verbal Reasoning Practice Test 1

The fact that would most strengthen this argument is the percentage of cases in which DNA evidence overturned prior convictions. If half of all cases resulted in erroneous convictions that were later cleared by DNA evidence, then that should certainly draw other convictions into doubt. The fact that one in three of today’s convictions rest on DNA evidence has no bearing on prior convictions, so choice A is incorrect. Similarly, the admissibility of DNA evidence (choice B) has no bearing on the quality of prior convictions. That DNA evidence is accurate (choice D) and difficult to tamper with (choice E) strengthens the argument for the use of DNA evidence in court, but it does not directly strengthen the argument that prior convictions should be called into doubt.