Really hard indeed!. Mind blowing. At first I thought C but then I cheated ( it is hard even cheating...) and drawing the diferent posibilities I only see A=D a

Really hard indeed!. Mind blowing. At first I thought C but then I cheated ( it is hard even cheating...) and drawing the diferent posibilities I only see A=D and B=C. I dOn't know what I am missing.