Paragraph Completion

I'm not sure about the answer. I think it is C. Can you help me with this?

"There are about one billion pigs in the world. On large modern pig farms, the animals are kept indoors in controlled conditions and fed a mixture that makes them put on the most weight in the shortest time. Their meat is sold as pork (fresh meat), bacon or ham (cured or preserved meat). .................................................................. However, many of those varieties have now disappeared with the development of intensive farming methods."

A- Livestock farmers ought to keep fewer pigs for meat

B- Chickens are descended from tropical forest birds found in South Asia

C- About 400 breeds of pigs have been produced over the centuries

D- Poultry farmers keep a variety of birds for meat and eggs

E- In parts of France, geese are kept to make the famous pate of goose liver