Judicial, Legislative,Executive
Hello,
The Selection committee for the exhibit was amazed to see such fine work done by a mere amateur.
Hope this helps !
It should be formal! (answer b).
The hint in the question is that the city major will attend the ceremony- this tells you that the ceremony will have a more representative, formal character, and will not be an internal celebration among people who know each other (this would make it informal or semi-formal).
