Concept:Unity among ethnic groups is sustained through mutual respect and tolerance of one another’s culture.
Explanation:Option A refers to political leadership, not directly to ethnic unity.
Option B refers to freedom of movement, which is a right, not a specific way to sustain ethnic unity.
Option C encourages people to accept and value the cultural practices of other ethnic groups, which promotes harmony and reduces misunderstanding.
Option D is about maintaining law and order, not sustaining ethnic unity positively.
Answer:C. appreciating the cultural practices of other people.