Animals which were originally feral, such as dogs, horses, and sheep, have been domesticated for the purpose of producing foods and goods, providing faster transportation, and serving as pets for amusement as early as the Stone Age.
A. Animals which were originally feral, such as dogs, horses, and sheep, have been domesticated
B. Animals which used to be feral , such as dogs, horses, and sheep, have been domesticated
C. Dogs, horses, and sheep are examples of animals which were originally feral and have since been domesticated
D. Dogs, horses, and sheep are examples of animals which were originally feral and had been domesticated
E. Dogs, horses, and sheep are examples of animals which were originally feral and were domesticated

[spoiler]OA: E. [/spoiler]