According to the passage, what was badly needed to improve industrial efficiency

A．managed to launch the Spanish Civil War
B．frightened the whole world into silence
C．went on to wipe out Dresden and Hiroshima
D．did not admit their crime

A．Every element in Gnerniea has a clear and accurate reference.
B．Picasso never cared whether or not other people could understand what he painted.
C．Picasso's mural Guernica has caused critics' arguments about its political implications.
D．In Guernica, Picasso painted a Spaniard who looks extremely painful as well as angry.