①A+B^2＋ =A^2＋＋B ， ②D +2H₂O=D(OH)₂ + H₂↑，③以B、E为电极与E的盐溶液组成原电池，电极反应为：E^2＋+2e^－="E" ，B—2e^－=B^2＋
A．E^2＋>B^2＋>A^2＋>D^2＋                      B．D^2＋>E^2＋>A^2＋>B^2＋
C．D^2＋>B^2＋>A^2＋>E^2＋                      D．A^2＋>B^2＋>D^2＋>E^2＋