Final answer:
The hair conditioner is applied after a chemical relaxing treatment to remove any remaining chemical residue.
Step-by-step explanation:
The correct answer is C) To remove any remaining chemical residue.
After a chemical relaxing treatment, a hair conditioner is applied to remove any remaining chemical residue. Chemical relaxing treatments involve the use of chemicals to break and rearrange the disulfide bonds in the hair, which changes its structure and makes it straight. The conditioner is then used to neutralize the chemicals and restore the hair's pH balance.