Decide which of the following is common knowledge and needs no<br/>referencing. A: <br/>There have been about 400 cancer deaths among 100,000 Japanese<br/>nuclear bomb survivors. B: The<br/>negative effects of GM crops have been shown on animals in many<br/>studies. C: The<br/>Big Bang theory posits that the universe began billions of years ago<br/>with an enormous explosion. D: Generally,<br/>there are two kinds of light pollution: ecological pollution and<br/>astronomical light pollution.