The sequence of development of the embryo sac is:

• A
  Archesporium $\rightarrow$ megaspore mother cell $\rightarrow$ megaspore $\rightarrow$ embryo sac
• B
  Archesporium $\rightarrow$ megaspore $\rightarrow$ megaspore mother cell $\rightarrow$ embryo sac
• C
  Archesporium $\rightarrow$ megaspore $\rightarrow$ megasporophyte $\rightarrow$ embryo sac
• D
  None of the above