Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Until recently, nobody realized that Earth is exposed to unpredictable violent impacts from space. B. In the last few decades, the risk of a random violent impact from space has increased. C. Since most violent events on Earth occur randomly, nobody can predict when or where they will happen. D. A few decades ago, Earth became the target of random violent events originating in outer space.