Beth Has Just Had an Ultrasound and Is Devastated to Learn

Multiple Choice

Beth has just had an ultrasound and is devastated to learn that although the placental membranes have grown,the embryonic disk has not.Given what you know about the survival rate of zygotes,should Beth be surprised?

A) yes, because the survival rate is about 80 percent
B) yes, because the survival rate is about 50 percent
C) no, because the survival rate is about 25 percent
D) no, because the survival rate is about 10 percent