Final answer:
The correct order of prenatal development stages is germinal, embryonic, and fetal, starting from fertilization and implantation through to organ development and growth until birth.
Step-by-step explanation:
The correct developmental sequence of the periods of prenatal development is germinal, embryonic, fetal. This corresponds with the provided options as a) germinal, embryonic, fetal.
During the germinal stage (Weeks 1-2), which begins at fertilization, the zygote undergoes several cell divisions and ultimately implants in the uterus. Following implantation, the embryonic stage commences, lasting from the third to the eighth week after fertilization. It is marked by significant growth, the formation of the three germ layers, and the beginning of organ development. Finally, the fetal stage begins at the ninth week of gestation and continues until birth, characterized by rapid growth and maturation of body systems and organs.