Final answer:
End-paper techniques in the perm procedure are used to straighten the hair.
Step-by-step explanation:
In the perm procedure, end-paper techniques are used to straighten the hair.
During the perm procedure, chemicals are applied to the hair and it is wrapped around forms. This process changes the shape of the hair, making it curly or wavy. End-paper techniques are a specific wrapping technique that helps to eliminate crimps or irregularities in the hair and create a more uniform curl or wave pattern.
Therefore, the correct answer is A) Straighten the hair.