C. They believed it helped a person enter the afterlife more smoothly.
The ancient Egyptians practiced mummification because they believed that preserving the body was essential for the deceased to successfully enter the afterlife. They thought that the spirit (ba) would need the physical body (ka) to reside in after death. Mummification was a way to ensure that the body remained intact for this journey and to provide a home for the spirit in the afterlife.