A naturally occurring deposit of radioactive material similar in composition to the dangerous waste produced by applications of nuclear technology has been found deep within the Earth' s crust. No ill effects have been traced to this naturally occurring deposit. Since engineers have now developed a way to store manufactured nuclear waste as deeply within the Earth' s crust as the recently found natural radioactive deposit, the safe disposal of nuclear waste can now be initiated. Which one of the following, if true, most seriously weakens the argument?
A: Continued production of nuclear waste at the current rate will eventually outstrip available capacity for safe storage.
B: The total amount of dangerous waste produced annually has been declining in recent years.
C: It cannot currently be determined what the geological conditions are under which the naturally occurring radioactive deposit has apparently been safely contained.
D: Not one of the current methods used to dispose of nuclear waste has proved to be completely safe.
Choose A, B, C or D as your solution.
C