How to respond to “Why do you deserve a promotion”?

Our company has a new IT manager and it is suddenly the time for promotions. He is still new to the company and he doesn't have much knowledge about the employees. My project manager spoke about my situation with the IT manager and he (the IT manager) decided to have a 1 to 1 meeting with me. One of the questions I was told to prepare an answer for is "Why do you deserve a promotion"?