Which of the Following Statements About Chick and Mouse Embryos

Which of the following statements about chick and mouse embryos is false?

A) Chick and mouse embryos differ in the number of their cervical vertebrae.
B) Chick and mouse embryos differ in the number of their thoracic vertebrae.
C) The presence of Hoxc6 expression affects the identity of vertebrae in different ways in chicks and mice.
D) The expression pattern of Hoxc6 differs in chicks and mice.
E) All of the above are true; none is false.