Which of the following will make an application letter more effective?

A) Knowledge and professionalism
B) Creative graphics and design elements
C) Bold,bright colors
D) Salary history
E) A firm belief that no one will do the job as well as you

Knowledge and professionalism are key factors in making an application letter more effective. It's important to showcase your skills and experience in a clear and confident manner, and to demonstrate your understanding of the position and the company you are applying to. Creative graphics and bold colors may catch the eye, but ultimately it is the content and presentation of your qualifications that will determine whether or not you are considered for the job. Salary history should only be discussed if the job posting specifically requests it, and a firm belief that no one else can do the job as well as you can come across as arrogant and unprofessional.