The expression "hog-wild" means ______.

A．pigs are not very intelligent
B．the owners of pet pigs have their own society
C．pigs can never be popular
D．pigs live short lives because of their diet

A．pigs have remained unchanged for centuries
B．pigs are naturally vicious animals
C．pigs make a significant contribution to modem life
D．pigs are better than any other animal for laboratory