The mother of a child with flat feet asks the nurse why her child needs to wear corrective shoes. Which of the following is the most appropriate reason that the child needs to wear corrective shoes

A. Preventing the development of internal tibial torsion.
B. Strengthening the arches of the feet.
C. Keeping the legs in proper alignment.
D. Delaying the development of femoral anteversion.

班主任是班级建设的设计者，是班组组织的领导者，又是班组人际关系的___________。