Which of the following, if true, would most seriously weaken the argument made above that if scientists cannot reliably predict the daily weather, their predictions of a "nuclear winter" cannot be believed? A. The scientific theory of a nuclear winter uses data that is available to those who forecast the daily weather. B. Scientists' predictions about a nuclear winter are necessarily speculative, since they cannot be verified by harmless experimentation. C. Weather forecasters usually do not insist that their predictions are infallible. D. Scientific predictions of catastrophic natural events such as volcanic eruptions and earthquakes usually have less reliability than everyday weather predictions. E. The scientific theory of a nuclear winter is concerned with drastic climatic changes rather than day-to-day fluctuations in the weather.