Pre-natal stage:
- The correct answer is option C, which states that human development starts from the pre-natal stage.
- The pre-natal stage refers to the period of development before birth, from conception to delivery.
- It is during this stage that the basic structures and organs of the human body are formed.

Importance of the pre-natal stage:
- The pre-natal stage is a critical period in human development as it lays the foundation for future growth and development.
- It is during this stage that the embryo goes through rapid cell division and differentiation, forming the various organs and systems of the body.
- The pre-natal stage is also a time of vulnerability, as exposure to certain environmental factors or toxins can have a significant impact on the developing fetus.

Stages within the pre-natal period:
1. Germinal stage: This stage begins at conception when the sperm fertilizes the egg. The zygote undergoes rapid cell division and travels down the fallopian tube towards the uterus.
2. Embryonic stage: This stage starts after implantation in the uterus and lasts until the eighth week of pregnancy. During this stage, the major organs and systems begin to form.
3. Fetal stage: This stage begins at the ninth week and lasts until birth. The fetus continues to grow and develop, with organs becoming more refined and functional.

Factors influencing pre-natal development:
- Maternal health: The health and well-being of the mother play a crucial role in pre-natal development. Proper nutrition, avoiding harmful substances like alcohol and drugs, and regular prenatal care are essential for a healthy pregnancy.
- Environmental factors: Exposure to toxins, pollutants, or certain medications during pregnancy can have a negative impact on the developing fetus.
- Genetic factors: Genetic factors inherited from parents can influence pre-natal development and determine certain characteristics and traits.

Conclusion:
In conclusion, human development starts from the pre-natal stage, which encompasses the germinal, embryonic, and fetal stages. This period is critical for the formation of organs and systems and sets the stage for future growth and development. Maternal health, environmental factors, and genetics all play a role in shaping pre-natal development.