What Will Happen by the End of the Eighth Week

Multiple Choice

What will happen by the end of the eighth week of development?  

A) Limbs form, and paddles at their ends are sculpted into digits.
B) The umbilical cord and the circulatory system develop.
C) All of the organ systems will be formed, and apoptosis has eliminated the tail.
D) The fetal heartbeat can be heard clearly through a stethoscope positioned on the mother's abdomen.
E) The fetus has begun not only to detect sounds but also to remember some of them.