Which of the Following BEST Distinguishes Between Zygotes and Embryos

Multiple Choice

Which of the following BEST distinguishes between zygotes and embryos?

A) Zygotes are fertilized eggs within the oviduct;embryos are fertilized eggs in the uterus.
B) Fertilized eggs are called zygotes until they implant in the uterine lining and embryos after that.
C) Fertilized eggs are zygotes until they begin to divide,at which time they are called embryos.
D) Zygotes are eggs that haven't been fertilized;embryos are fertilized eggs.
E) Embryos are eggs fertilized in the oviducts;zygotes are eggs fertilized in the uterus.