All Labrador retrievers love playing fetch. Only German shepherds love protecting their home. Some dogs are easy to train. Brittany' s dog loves playing fetch and loves protecting her home. Which one of the following statements must be true?
A: Brittany 's dog is easy to train.
B: Brittany's dog is half Labrador retriever and half German shepherd, and her dog is also easy to train.
C: Brittany 's dog is a Labrador retriever.
D: Brittany 's dog is a German shepherd.
Choose A, B, C or D as your solution.
D