Final answer:
The reason that is NOT why one should study chemical texture services is that salons require cosmetologists who do hair color services to also do texture services as employment condition; this is not a universal requirement.
Step-by-step explanation:
The question asks which of the given reasons are NOT why one should study chemical texture services. Answering this will require a look at the practical aspects of chemical texture services, which include hair coloring, perms, and chemical straightening or relaxing. These services change the physical texture of hair to meet aesthetic desires such as following hairstyle trends, covering grey hair, or achieving a certain fashion statement. Chemical texture services can be in high demand and require cosmetologists to have knowledge of them to perform safely and meet client expectations.
However, while salons may have various requirements for their employees, it's not a universal condition of employment for cosmetologists who perform hair color services to also perform texture services. Thus, the statement "C) salons require cosmetologists who perform hair color services to also perform texture services as a condition of employment." is the exception and not a reason to study chemical texture services.