Final answer:
Combing hair roughly after a chemical relaxing treatment may lead to breakage due to the weakened state of the hair from the treatment. The correct option is C.
Step-by-step explanation:
Combing tangles roughly from the hair after a chemical relaxing treatment may cause hair breakage. During the relaxing process, the disulfide bonds within the hair strands are broken to alter the hair's texture. These bonds are some of the strongest in the hair's structure, and breaking them makes the hair more fragile.
Following the treatment, the hair is in a weakened state and rough handling can easily lead to damage. Products and techniques used during this time should aim for gentle handling to prevent further stressing the hair. The correct option is C.