**Development of the Foetus**

The development of the foetus refers to the growth and maturation of the embryo into a fully formed baby. It is a complex process that occurs over a period of approximately nine months. The development of the foetus takes place in the female reproductive system, primarily in the uterus. However, it is important to note that the journey of the fertilized egg begins in the fallopian tube before it implants itself in the uterus. Therefore, the correct answer to the question is option C - both the uterus and the fallopian tube play a role in the development of the foetus.

**Development in the Fallopian Tube**

1. Fertilization: The journey of the foetus begins with fertilization, which occurs in the fallopian tube. When a sperm cell successfully penetrates the egg, fertilization takes place, resulting in the formation of a zygote.

**Development in the Uterus**

2. Implantation: After fertilization, the zygote undergoes multiple cell divisions as it travels through the fallopian tube towards the uterus. Once it reaches the uterus, it implants itself into the thick lining of the uterine wall, a process known as implantation.

3. Placenta Formation: After implantation, the cells surrounding the zygote develop into the placenta. The placenta plays a crucial role in providing oxygen, nutrients, and removing waste products from the foetus.

4. Organ Development: Over the course of the pregnancy, the foetus's organs and body systems begin to develop. This includes the formation of the central nervous system, cardiovascular system, respiratory system, digestive system, and many others.

5. Growth and Maturation: As the foetus develops, it undergoes significant growth and maturation. It gradually increases in size and weight, and its body structures become more defined. This includes the formation of limbs, facial features, and internal organs.

6. Movement and Sensory Development: As the pregnancy progresses, the foetus becomes more active and responsive. It starts to move its limbs, swallow, hiccup, and even respond to external stimuli such as sound and light.

7. Final Stages: Towards the end of the pregnancy, the foetus prepares for birth. It assumes the head-down position, which is the ideal position for vaginal delivery. It also undergoes changes in the lungs, digestive system, and other organs to adapt to the outside world.

**Conclusion**

In summary, the development of the foetus occurs in both the uterus and the fallopian tube. The journey begins in the fallopian tube with fertilization, followed by implantation in the uterus. The uterus provides the necessary environment and support for the foetus to grow and develop over the course of the pregnancy.