70. From earliest to latest, the overall sequence of early development proceeds as follows:
(A) first cell division → synthesis of embryo's DNA begins → acrosomal reaction → cortical reaction.
(B) first cell division → cortical reaction → acrosomal reaction → synthesis of embryo's DNA begins.
(C) acrosomal reaction → cortical reaction → synthesis of embryo's DNA begins → first cell division.
(D) cortical reaction → synthesis of embryo's DNA begins → acrosomal reaction → first cell division.
(E) cortical reaction → acrosomal reaction → first cell division → synthesis of embryo's DNA begins.