The right answer is C. Zygote embryo fetus infant.
The zygote or egg is born from the union of a female gamete (an oocyte), and a male gamete (a spermatozoid).
The fertilized egg will undergo a series of cell divisions during its migration into the fallopian tube and the uterus.
We speak of embryo fertilization at the eighth week of embryonic development, after we talk about fetus until birth.