Final answer:
The nine-month period from conception to birth is known as the prenatal period, which includes the germinal, embryonic, and fetal stages ending with childbirth.
Step-by-step explanation:
The period that lasts nine months, extending from conception to birth, is called the prenatal period. The correct answer to the question is b) Prenatal. During this time, a developing human undergoes several stages of growth: the germinal stage, the embryonic stage, where the organ systems begin to form, and the fetal stage, which starts at the ninth week after fertilization and continues until birth. The gestation period is a term that refers to the length of development from conception to birth. In contrast, the neonatal period refers to the first to the thirtieth day of life outside of the uterus, and infancy describes the first year of life after birth.