Which of the following, if true, best challenges the main claim of the argument? A. The eruption of the Indonesian island of Tambora was even larger than that of Krakatoa, yet the average world temperature did not drop as much as it did following the eruption of Krakatoa. B. In 1883, the ocean-atmospheric phenomenon La Niña occurred, an event that is always followed by a drop of several degrees in the world's average temperature. C. Due to the effects of climate change, the average world temperature has been steadily increasing over the last few decades. D. According to sophisticated computer analysis, the eruption of Mt. Toba between 69,000 and 77,000 years ago, one of the most powerful ever, may have hastened an ice age. E. No volcanic eruption in the 20th century was close to the magnitude of the Krakatoa eruption, yet average world temperatures dropped between 1950 and 1960.