Which of the following is the correct order of cellular development?

A)Zygote - morula - blastula - gastrula
B)Zygote - morula - gastrula - blastula
C)Morula - blastula - gastrula - zygote
D)Blastula - gastrula - zygote - morula
E)Gastrula - zygote - morula - blastula