Which part of the human eye is responsible for the formation of the image?

The Image is formed on the Retina of the human eye.
The human eye consists of many functional parts. Every part is designed for a specific function. e.g. lens is part of the eye through which light enters the eye. Similarly, the retina is that part of the eye on which the image of an object is formed. 

Hence, the correct option is the retina.