答案：D

此题考查省略和强调。该句补充完整为：No，not all the passengers on the bus were injured in the accident.It was only the four who got hurt.所以答案为D项。由答语补充完整的句子我们不难发现B项错误。答语中用了强调结构，强调了主语only the four，因为被强调部分是人，所以可以用who替代that。