We need to find an answer choice that directly supports the concern about potential geological faults in the mountain and the associated risks of nuclear waste seepage.
Premise: A geological fault in the mountain is possible. Fault => Seepage => Dangerous nuclear waste for up to 25,000 years/.
Conclusion: Don't store nuclear waste under this mountain until it is investigated for geological faults.
Goal: Find evidence that supports the geologist's caution about the potential fault in the mountain or the importance of conducting the investigation.
(A) In a few thousand years, human civilization may no longer exist.This is irrelevant to the geologist's argument. The potential risk of nuclear waste seepage is based on the danger it poses regardless of whether human civilization exists. This does not address the geologist's concern about the faults. If anything, it might weaken the argument as the non-existence of a human civilization may indicate we don't need to worry so much about the future dangers of nuclear waste.
Eliminate (A).(B) The scientists’ investigation would conclusively show whether or not the mountain has any geological faults.This choice directly supports the geologist's argument. If the investigation can conclusively determine the presence of faults, it justifies the geologist's recommendation to investigate before deciding on the storage location. It strengthens the argument by showing the investigation's necessity and potential to provide critical information.
Keep (B) as it strengthens the argument.(C) The proposed facility was not initially intended to be used for the storage of nuclear waste.This fact does not address the argument about the potential geological fault or the need for an investigation. Whether the facility was initially intended for nuclear waste storage is irrelevant to the argument's main concern about safety and the geological fault .
Eliminate (C).(D) The scientists’ investigation would increase dramatically the cost of storing nuclear waste under the mountain.This weakens the argument rather than strengthens it. Mentioning the cost increase could be used as a counterargument against the investigation rather than a reason to support it.
Eliminate (D).(E) Nuclear waste could be stored in the proposed facility on a temporary basis.This suggests a possible alternative but does not address the core issue of the geological fault's potential danger. The geologist's concern is about long-term safety, not temporary storage. Therefore, this option does not strengthen the argument that an investigation is needed.
Eliminate (E).Correct Answer is
(B) The scientists’ investigation would conclusively show whether or not the mountain has any geological faults as it strengthens the argument by showing that the investigation would be decisive in identifying faults, which directly supports the geologist's call for caution and further study before proceeding with the nuclear waste storage.