如图所示这四位同学描述的是同一化学符号，此化学符号是(  )

阅读诗歌，回答问题。

                                                                      十一月四日风雨大作
                                                                                  陆游
                                                      僵卧孤村不自哀，尚思为国戍轮台。
                                                      夜阑卧听风吹雨，铁马冰河入梦来。