【单选题】

Which of the following statements is true
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.