It would be D, pie chart :)
The idiom “cold blood” means that you kill someone without a cruel or ruthless intent. For example, the killer came up to a man while he was sleeping and killed him in cold blood. This means that the killer killed the man in a calm manner.
~Good luck
One similarity is they both make wonderful pets. A huge difference is a Maltese has no undercoat and is described as a white fluff ball and a German Shepherd is multicolored coming in white, black, brown. The Maltese is a tiny breed while German Shepherds are big and strong