【单选题】根据以下资料,回答下列各题: The Belgian blue is an ugly but tasty cow that has 40%more muscle than it should have. It is the product of random mutation followed by selective breeding--as,indeed,are all domesticate...
A.
It was produced like all other domesticated creatures.
B.
It was produced by natural breeding.
C.
It was produced using genetic engineering as a short.cut.