The correct answer is A) preserving the body afterlife.
The purpose of mummification is preserving body afterlife.
Egyptian Pharaohs were considered the representant of the gods incarnated on Earth. People believed they were the representants of the gods. In the Egyptian Book of the Death, it is described the afterlife path to heaven, to the house of the gods. So the Pharoh had to be mummified in order to preserve his body and use it again afterlife in his path to get to heaven. That is why in the Pharaoh's tomb, archeologist found all his personal belongings because it was believed that he would need in the afterlife.