Why should we hire you?
Example of a good answer: “If you compare the qualifications that I have with the requirements you need, you will see that I am a compatible person to occupy that position. You are looking for someone who has many years of experience and expertise that I have in this field. Besides that, I have excellent writing skills. I have the ability to work with diverse people from all walks of life.”
This is the most powerful answer. The best way to influence the interviewer that you are the best person to occupy the job is to present yourself as a person who best fits the necessary requirements as closely as possible. Make it so that they know that you are the right person by telling them about your skills, especially in specific areas required.