Answer:
C- the sentence uses a formal style
Step-by-step explanation:
What makes the style of the sentence "l am writing to apply for a customer service representative position which was advertised on your company's website" effective is the uses of a formal style and an appropriate language, register and conventions for a formal letter of application. Furthermore, the candidate stated his or her reason of writing , the position interested in and where the applicant came across the advertisement
A formal style of writing is mainly use by a company to another, or between such organizations and their clients or customers, or external parties. The overall style to be use depends on the relationship between the parties involved. A formal style writing produces a lasting written record, and it's usually taken more seriously by the receiver of such writing than other forms of communication