The correct answer is C. To develop a group of performers for holiday assemblies.
The other options are all important objectives of an elementary music program. Option A, to expose children to a variety of musical compositions, is important because it helps children develop their musical taste and appreciation. Option B, to prepare children for wise use of leisure time, is important because it helps children develop healthy habits and interests. Option D, to provide children with emotion outlets, is important because it helps children express themselves and cope with their emotions in a healthy way.
Option C, to develop a group of performers for holiday assemblies, is not as important as the other options because it is not essential for all children to participate in performance groups. Some children may not be interested in performing, and others may not have the necessary skills or talents. It is more important for all children to have the opportunity to experience music in a variety of ways, and to develop their musical appreciation and skills.
In addition, developing a group of performers for holiday assemblies can be very time-consuming and expensive. This time and money could be better spent on other activities that would benefit all children, such as providing music instruction to all children or offering more opportunities for children to participate in music ensembles.