Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
People think that increasing levels of carbon dioxide and other greenhouse gases will inevitably lead to global warming.
A. Global warming is thought to result in increasing levels of carbon dioxide and other greenhouse gases.
B. Increasing levels of carbon dioxide and other greenhouse gases is thought to be responsible for global warming.
C. Increasing levels of carbon dioxide and other greenhouse gases is attributed to global warming.
D. Global warming is blamed for increasing levels of carbon dioxide and other greenhouse gases.