It is recognized that students' volunteer work will benefit communities. However, its primary purpose is to contribute to students' development.

A. Although it is recognized that students' volunteer work will benefit communities, its primary purpose is to contribute to students' development.

B. As it is recognized that students' volunteer work will benefit communities, its primary purpose is to contribute to students' development.

C. As the primary purpose of students' volunteer work is to contribute to students' development, its benefit to communities is recognized.

D. To recognize the benefit of students' volunteer work to communities, it is to note that its primary purpose is to contribute to students' development.