单选题 The author suggests that all of the following is true concerning the cloning process EXCEPT

• (A) The sheep was chosen as an ideal subject because of its genetic development, not for its precedence as a research subject.
• (B) The human embryo comes to rely upon its own genetic code at an earlier stage of development than the mice embryo.
• (C) The unfertilized sheep egg acquires a limitless supply of protein from the mother' s ovary.
• (D) The earlier the foreign nucleus assumes genetic control of the embryo, the more successful it will likely be.
• (E) The foreign nucleus transplanted to an embryo may be consider "older" than the nucleus it replaced.