GRE Reading Comprehension: Manhatton-GRE阅读Manhatton - E8SFG2A64MFK10UDA$

Which of the following most accurately expresses the author's intent in writing the passage? A. to describe the discovery and reason for the cosmic microwave background. B. to explain how science discoveries can be made accidentally. C. to argue that the cosmic microwave background is the oldest observable in the universe. D. to defend the work of Penzias and Wilson. E. to support the theory of the Big Bang using the cosmic microwave background.