Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 2? Incorrect choices change the meaning in important ways or leave out essential information. A. The rapid rise of carbon dioxide concentrations can be attributed largely to the actions of humans. B. Predictions about atmospheric concentrations of carbon dioxide indicate that the influence of human activities will double soon. C. In the next 50 to 100 years, human activities will no longer have an influence on atmospheric carbon dioxide concentrations. D. Human activities can influence current predictions about atmospheric conditions.