Which of the Following Is the Correct Sequence Through Which $\rightarrow$

Which of the following is the correct sequence through which early development proceeds?

A) morula $\rightarrow$ zygote $\rightarrow$ gastrula $\rightarrow$ blastula
B) zygote $\rightarrow$ blastula $\rightarrow$ morula $\rightarrow$ gastrula
C) zygote $\rightarrow$ blastula $\rightarrow$ gastrula $\rightarrow$ morula
D) zygote $\rightarrow$ gastrula $\rightarrow$ blastula $\rightarrow$ morula
E) zygote $\rightarrow$ morula $\rightarrow$ blastula $\rightarrow$ gastrula