16 Where did the students work on their projects?

The text mentions that Anita and her group worked on their projects for two weeks before the fair, and that the other groups also worked on their projects, with one group showing how important light is to grow plants and another group stopping an apple from turning brown. The text also states that students walked around the hall to look at other students' projects. This implies the work was done within the school premises, likely in classrooms or a designated area for the fair.

Answer: A in the hall