Answer:
1) I believe that I would make an excellent receptionist at Animal Lovers Veterinary Clinic, because I have extensive customer service experience.
Explanation:
The best revision that best removes the informal language is number 1. So It is the most formal sentence. When you want to speak or write using formal language you have to make an introduction before saying what you want to ask or tell to the other person. You can use some introductions like the following:
- I believe that...
- I would like...
- Could you please....
- You could try...